The Evidence That Wins a Hangar Property Tax Appeal

Abstract

1. Introduction

A hangar on leased airport land is the kind of property mass appraisal handles worst. It is a special-purpose building with thin market evidence, sitting on land the taxpayer does not own, held under a lease that restricts what the taxpayer may do with the improvement and usually takes it away at the end of the term. None of that fits a model built for retail, office, and warehouse.

The result is that hangar assessments are wrong at a higher rate than assessments generally, that the errors tend to be structural rather than marginal, and that they persist for years because nobody appeals. The appeal is winnable. It is winnable only on a record assembled before a deadline that is usually jurisdictional, and only if the record answers the questions the governing regime actually asks.

That last qualification is where most of the losses come from. A great deal of published advice on hangar tax appeals proceeds as though there were a single American rule. There is not. The threshold question is not what the hangar is worth. It is what interest is being taxed, to whom, and under what measure, and the answer changes the evidence completely. A ground lease with a short remaining term and a reversion clause is the central exhibit in California and close to irrelevant in Ohio. An appraisal of market rent decides the case in California and has no application at all in Arizona, where the tax is computed on square footage.

This paper is organized to follow that order of operations. Section 2 states the threshold question. Section 3 sets out the four regimes. Section 4 addresses whether the lease is evidence, and corrects the unencumbered fee premise. Section 5 addresses the cost approach and the proof of obsolescence. Section 6 addresses the burden of proof and where it shifts. Section 7 sets out the record. Section 8 addresses uniformity claims. Section 9 addresses deadlines. Section 10 reports what the hangar cases actually hold.

2. The Threshold Question

Before any argument about value, establish what is on the roll and under what authority.

Request the property record card. It is called the field card, the appraisal record, or the parcel record depending on the jurisdiction. The assessing profession's own glossary defines it as the card on which the assessor carries a sketch or photograph of the building, a description of its location, a list of the principal factors affecting reproduction cost and depreciation, and the calculations by which cost and depreciation were estimated. Some states require it by statute. Ohio requires the county auditor to adopt and use a real property record approved by the tax commissioner for each parcel and to record on it the true and taxable value of each building, structure, or improvement, which value is included as a separate part of the total.

In many states the record is open to inspection and the taxpayer's entitlement runs further than the card itself. Virginia is the cleanest statutory example. It opens all property appraisal cards to inspection during normal office hours after the reassessment notice is mailed, and it separately entitles the taxpayer or a representative to examine the working papers used to determine appraised and assessed value and the valuation methodology, including the capitalization rate used, the comparable properties or sales considered, and any other market surveys, formulas, or matrices considered, together with a written explanation justifying any increase on request. Where such a provision exists it is usually the most productive request in the file, because a capitalization rate and a comparable list are testable in a way that a card entry is not. In other states the records are released only to the owner or a designated representative, so the request has to come from the taxpayer.

Read the card for the classification, the land treatment, the building type, the square footage, the year built, the condition rating, and whether land is being assessed to the taxpayer at all. A meaningful share of hangar over-assessments resolve at this stage because the card describes a building that does not exist: square footage that includes apron, a year built that predates a demolition, or a use classification that never applied. That is a correction rather than a valuation dispute, and it is the easiest relief available. The assessing standards recognize it as its own ground of appeal, listing factual error, meaning a data collection or clerical error, alongside an equity or uniformity claim and a belief that the valuation is inaccurate.

No published study quantifies how often assessor records contain such errors, and this paper does not report a rate. What exists is a standard prescribing how a jurisdiction measures its own record accuracy. It defines four dimensions of data quality, accuracy meaning the degree to which records reflect reality, together with currency, consistency, and completeness; it lists sampling, anomaly detection, continuous monitoring, and data exploration as measurement methods; and it recommends property data sampling at a ninety percent confidence level with an allowable error of ten percent, using blind and quality-controlled data collection, with the inspection template excluding primary valuation drivers such as building class, square footage, or effective age in order to avoid bias, and a property data accuracy report listing discrepancies. A practitioner who wants a number should ask the jurisdiction for its own sampling result.

3. The Four Regimes

Possessory interest is used loosely in practice to mean any taxation of a private interest in public property. It covers at least four mechanisms that differ in what they tax, how they measure it, and what evidence bears on the result.

3.1 A Value-Based Interest Tax

California taxes the possessory interest itself. The statute defines a possessory interest as possession of, a claim to, or a right to possession of land or improvements that is independent, durable, and exclusive. The implementing rule treats taxable improvements on tax-exempt land as a possessory interest, which is the direct hook for a tenant-built hangar, and the examples rule names airports expressly among the settings where a taxable possessory interest arises.

The rules also contain aviation-specific limits. The definition of independence gives as its example that control of an airport runway or taxiway by the Federal Aviation Administration or another government agency is so complete that it precludes airlines from exercising sufficient authority and control over management or operation, and therefore does not support a possessory interest. Airport hallways, common areas, and access roads are likewise excluded from possession.

Colorado and Alaska operate value-based regimes with materially different measures. Colorado makes possessory interests in exempt government property taxable and values non-ski-area interests at the present value of reasonably estimated future annual rents or fees required to be paid through the stated initial term of the lease. Alaska exempts municipal, state, and university property but makes a private leasehold, contract, or other interest in the property taxable to the extent of the interest, and applies the same formula to federal property.

The contrast between California and Colorado is worth stating because the two are frequently described together. California values the interest at fair market value, disregards the rent, and uses the reasonably anticipated term of possession. Colorado uses the stated initial term and the actual rents. A practitioner who carries California habits into a Colorado appeal will build the wrong case.

3.2 A Lessee-User Tax That Mirrors Ownership

Michigan and Minnesota tax the private user of exempt property as though the user owned it. Michigan provides that exempt real property used by a private party in connection with a business conducted for profit is taxable to the lessee or user in the same amount and to the same extent as though the lessee or user owned it. Minnesota imposes the tax for the privilege of using or possessing the property, again in the same amount and to the same extent as though the lessee or user were the owner.

Each carries an exemption that decides hangar cases. Michigan exempts property used as a concession at a public airport, park, market, or similar property that is available for use by the general public. Minnesota's exemption is drafted for hangars and is treated in Section 3.5.

Minnesota adds two mechanical features worth noting. The tax is payable as a personal property tax, assessed to the lessee or user, and it does not become a lien against the property. Real property of the federal government, the state, or a political subdivision that becomes taxable under the provision must be assessed and collected as a personal property assessment.

3.3 An Excise on Rent That Displaces Property Tax

Washington took a different route. The legislature found that a uniform method of taxation should apply to leasehold interests in publicly owned property and imposed a leasehold excise tax to compensate governmental units for services rendered to lessees. The statutory rate is twelve percent of taxable rent plus an additional levy; the state revenue department reports the combined rate as 12.84 percent, of which 6.84 percent is state and 6.00 percent local. The property tax side is switched off: the state exempts from property tax any rights to occupy or use real or personal property owned in fee or held in trust by the United States, the state, its political subdivisions, or federally recognized tribes, together with any leasehold interest arising from that property, subject to narrow carve-outs.

The base is contract rent, defined to include cash payments, sublessee rents, expenditures protecting the lessor's interest, and expenditures for improvements to the property to the extent the improvements become the property of the lessor. Taxable rent equals contract rent where the lease was competitively bid, set by statute, or shown by public record to be the maximum attainable; otherwise a separate determination applies.

One provision controls the hangar case and it points the other way. Notwithstanding anything else in the chapter, improvements owned or being acquired by a lessee or sublessee that are not defined as contract rent are taxable to that lessee or sublessee as property at full true and fair value, without any deduction for interests held by the lessor or others. A tenant-built hangar in Washington is therefore not swept into the excise base at all. It is assessed as real property to the tenant, at full value, with the lessor's reversion expressly disregarded.

3.4 A Per-Square-Foot Excise Unconnected to Value

Arizona's government property lease excise tax is not a value tax. It applies to a government property improvement, meaning a building with a certificate of occupancy whose title of record is held by a government lessor, on government-held land, available for commercial, residential rental, or industrial use. The government lessor levies and the county treasurer collects an annual excise on each prime lessee.

The rates are stated per square foot. Warehouse or industrial space carries one rate and other improvements a higher one, and the rate steps down with building age, falling to twenty percent of the base rate at forty to fifty years and to zero at fifty years or more. An appraisal is irrelevant to the computation. Square footage, use category, and age are the whole of it.

3.5 Where Hangars Are Excluded by Name

Three states name hangars in the operative text.

Arizona excludes from the excise property used for or in connection with aviation, listing hangars first, together with tie-downs, aircraft maintenance, sale of aviation-related items, charter and rental activities, commercial aircraft terminal franchises, rental car operations, parking facilities, and terminal restaurants, stores, and services. A separate subsection excludes commercial airline use of runways and terminal facilities at state, city, town, and county airports.

Minnesota excepts from the lessee-user tax property of a municipally owned airport that is leased to or used by any person or entity including a fixed base operator and is used as a hangar for the storage or repair of aircraft or to provide aviation goods, services, or facilities to the airport or the general public. Two carve-outs bring the tax back: property at airports owned or operated by the metropolitan airports commission or by a city of more than fifty thousand population or its airport authority, and hangars leased in connection with a for-profit business other than an aviation-related business. Separate exceptions cover public pedestrian ramps and concourses and passenger check-in, ticket counter, boarding, and luggage claim areas at the smaller airports.

Indiana names hangars within its definition of land used for public airport purposes, which includes real property used in providing for the shelter, storage, or care of aircraft. The surrounding subsections cover runways, taxiways, lighting, access roads, parking, and buildings providing basic facilities for the traveling public; operations and maintenance property, leased agricultural land within the area federal law and regulation restrict to aviation activities, runway protection zones, avigation easements, and safety areas; and housing for weather, navigational aid, and radio equipment. Land areas used solely for purposes unrelated to aviation are excluded. The exemption requires a current valid public airport certificate from the state transportation department, and private owners must file the exemption application while municipal owners need not. A separate provision exempts improvements leased from an airport authority.

One legislative caution. A 2025 Minnesota bill would have reduced net tax capacity by fifty percent for hangars at airports in cities between fifty thousand and one hundred fifty thousand population, for taxes payable 2026 through 2037, partially closing the gap the existing carve-outs create. It did not become law. The current statutory text contains no such provision and the section's history records no 2025 or 2026 amendment. A practitioner who saw the bill and assumed enactment will be advising on a rule that does not exist.

4. Whether the Lease Is Evidence

4.1 The Unencumbered Fee Premise Needs Qualifying

The proposition that ad valorem assessment values the fee simple estate as if unencumbered, so that contract rent is not the measure of value, is widely repeated and frequently attributed to the assessing profession's standards. That attribution is wrong.

The International Association of Assessing Officers published a position paper in August 2019 addressing exactly this. It concludes that once the definition of fee simple absolute is clarified, it is evident that fee simple is a property rights concept that does not mean vacant or unencumbered by a lease, and that it is not a value concept to be used interchangeably with market value. It observes that an appraiser can value the fee simple ownership of an occupied apartment building assuming leases in place, market rents, or a lease-up period, and that the mere fact of tenancy does not detract from fee simple ownership. It then refers the operative question to state law: whether the appraiser or assessor considers easements or above- or below-market leases is defined by the appraisal assignment and, in the case of property taxation, by the jurisdictional requirements mandated by statutes and the courts.

The rule is real. Its home is statute and case law, not professional standards, and it therefore has to be established state by state.

Ohio states it by statute. The county auditor is to determine, as nearly as practicable, the true value of the fee simple estate, as if unencumbered but subject to any effects from the exercise of police powers or from other governmental actions, of each separate parcel. The Ohio Supreme Court applied the principle in a 1988 decision holding that the fee simple estate is to be valued as if it were unencumbered, rejecting valuation driven by mortgages or subsidy restrictions on the reasoning that the fee simple estate is not enhanced by above-market rents.

A later amendment matters for anyone relying on a sale. The legislature changed the auditor's treatment of an arm's-length sale price from mandatory to permissive, and the court held in 2017 that a recent arm's-length sale price is not conclusive evidence of true value, while remaining the best evidence and creating a rebuttable presumption that appraisal testimony may be directed against.

California states the rule by regulation and states it more explicitly than any statute. The fair market value of a taxable possessory interest is not diminished by any obligation of the possessor to pay rent or to retire debt secured by the interest. The rule then defines the interest as the fair market value of the fee simple absolute reduced only by the value of property rights granted by the public owner to other persons and by the value of rights retained by the public owner, expressly excluding the public owner's right to receive rent. The foundational case reached the same result in 1955, rejecting a deduction for the lessee's rent on the reasoning that rent is part of the purchase price of the leasehold, and directing that the assessor capitalize not the anticipated net earnings of the present lessee but those of a prospective assignee.

4.2 What the Lease Does Change

The California rule then enumerates the retained rights that do reduce value, and the list reads like an inventory of standard airport ground lease provisions: reversion on termination, the public owner's right to put the property to a higher and better use or to restrict use, the right to terminate on notice, rights of approval over sublease, assignment, and financing, and the right to allow other possessors to use the property.

That is the roadmap for a hangar tenant in a possessory interest state. Rent is irrelevant. Short reversion, use restrictions, termination on notice, and assignment consent rights are all value-reducing, and all of them appear in the standard ground lease.

The term of possession is the other battleground and the rule sets a high bar. The term for valuation purposes is the reasonably anticipated term of possession. The stated term is deemed to be the reasonably anticipated term unless it is demonstrated by clear and convincing evidence that the parties reached a mutual understanding, written or not, that the reasonably anticipated term is shorter or longer. A month-to-month interest, one without fixed term, or one of otherwise unspecified duration is deemed to have no stated term, and five criteria then apply: comparable sale prices, the rules, policies, and customs of the public owner, the customs of similar possessors, the relationship history, and amounts invested in improvements by either party.

The practical reading for a month-to-month T-hangar tenant is that the assessor's position is that the term is indefinite and the criteria supply it, and that dislodging a long implied term takes clear and convincing evidence rather than a recitation of the document.

4.3 Where Contract Rent Does Bear on the Result

The blanket statement that contract rent is irrelevant is as wrong as the blanket unencumbered fee statement. Contract rent enters in at least five ways.

In Washington it is the statutory base. In Colorado it is the measure through the stated initial term. In Arizona nothing is, because value plays no part in the computation. In Ohio, even under the express unencumbered fee statute, a sale price is the best evidence and presumptively true value, so the burden falls on the party arguing the encumbrance distorted it.

And in California, even under the rule that disregards rent as a measure, contract rent re-enters as evidence. The income provision permits economic rent to be estimated by reference to the contract rent for the subject interest, provided it was negotiated in an open and competitive market, and the comparable sales provision requires adding back to a sale price the present value on the sale date of any unpaid future contract rent for the term of possession.

The defensible formulation is this. Contract rent is excluded as a measure of value wherever the statute prescribes a fee simple or unencumbered standard. It is admissible as evidence of market rent where it was set in an open competitive market. And it is the statutory base itself in the excise states.

4.4 The Double-Count

Where the assessor is valuing the hangar improvement only, ground rent is an expense of the land, not of the improvement, and deducting it from the improvement's income charges the same item twice.

The 1955 California decision made the point in its own terms, rejecting the rent deduction because including it would require an item of expense based on the answer, namely the value of the property being determined. The court also disapproved earlier decisions requiring a deduction for the lessee's amortization charges, which would have produced a value of zero despite genuine income-producing capacity.

The affirmative mechanism is in the cost approach provision for possessory interests. Value is determined by adding the replacement cost new less depreciation of improvements that meet the requirements of the permitted use to the estimated value of the possessory interest in land, and then reducing that amount by the present value of improvements that will revert to or be retained by the public owner at the end of the term. The land component enters as the value of the possessory interest in land, which is already net of the public owner's retained reversion. Capitalizing the ground rent as an expense against the improvement charges it a second time.

5. The Cost Approach and Obsolescence

5.1 Why Hangars Reach the Cost Approach

The mass appraisal standard states the reason directly. The cost approach tends to be most appropriate in the appraisal of special-purpose properties, because of the distinctive nature of such properties and the general absence of adequate sales or income data. The same standard notes that the cost approach produces an estimate of the value of the fee simple interest in a property, that it is more reliable for newer structures of standard materials, design, and workmanship, and that the most difficult aspects are estimates of land value and accrued depreciation, which must be based on non-cost data, primarily sales, and can involve considerable subjectivity.

The standard is therefore simultaneously the justification for valuing a hangar by cost and the concession that the check on the answer is unavailable.

5.2 The Cost Tables Have Hangar Classifications

The principal commercial cost service carries three distinct hangar occupancies: a storage hangar, a maintenance and office hangar, and a T-hangar. The storage hangar is described as designed primarily for aircraft storage and light maintenance and repair, with some office and storage area and restroom facilities for small crews, and the highest quality storage hangars used for line servicing of large commercial airplanes. The maintenance and office hangar is described as similar but with more plumbing, electrical, and interior construction, the higher quality examples being main base facilities for commercial airlines. The T-hangar is described as multiple hangars for small planes, many with partitioned areas for individual aircraft, interiors with concrete slab floors and very few extras, minimum electrical, occasional plumbing, and commonly no heating or cooling.

These identifiers come from a service reference guide dated June 2011, not from a current subscription edition, and no current section, page, or cost figure is asserted here. The occupancy descriptions have practical value even so: a hangar carried on the record card under the wrong one of the three, most often a T-hangar carried as a maintenance hangar, will be costed against a specification it does not have.

Some states publish their own schedules with hangar line items rather than relying entirely on a commercial service.

5.3 Proving Obsolescence

The cost tables apply depreciation through age-life grids indexed to construction class and quality rank. Those grids measure physical deterioration. They do not see a door too narrow for the wingspans the market now flies, a clear span that will not accommodate current airframes, or an apron that cannot support the turn. The standards recognize functional obsolescence as the loss of value due to impairment, deficiency in design, or changes in style, taste, technology, needs, and demands, curable or incurable, and as the inability of a structure to perform adequately the function for which it is currently used; and external obsolescence as depreciation caused by negative factors outside the property. The mass appraisal standard directs that depreciation schedules be extracted from sales data. Neither the grid nor the extraction reaches a deficiency specific to one building unless the taxpayer puts it in the record.

The test for putting it in the record is well stated in the Indiana tax court's 2005 decision. A taxpayer claiming obsolescence must make a two-pronged showing: it must identify the causes of the alleged obsolescence, and it must quantify the amount to be applied. Identification requires showing through probative evidence that those causes are causing an actual loss of value to the property. Quantification requires probative evidence supporting the amount, using generally recognized appraisal principles. The court rejected a ninety-five percent depreciation claim for lacking methodology and evidence of actual loss, and put the standard memorably: pulling a number out of thin air is not a valid method of quantifying obsolescence.

That two-part test is the whole of the drafting instruction. Documenting functional obsolescence takes measurement rather than assertion: door width and height, clear height at the walls and at the peak, column spacing, apron depth and weight rating, then evidence of what the market at that field actually needs, then a quantification. The recognized measurement methods are cost to cure, defined in the assessing glossary as the estimated cost to correct or replace a component and, expressly, the cost to remedy deferred maintenance or functional obsolescence; and capitalized rent loss, which is the standard treatise method. A sixteenth edition carrying a 2026 copyright has been announced. Its release date could not be established, so page references here are to the fifteenth edition and anyone citing the treatise should confirm which edition governs before relying on a pin cite.

5.4 The Standard That Creates the Asymmetry

Section 5.1 explains why hangars reach the cost approach. The reason it is permissible for an assessor to cost a hangar off a schedule while the taxpayer’s appraiser may not is a standards asymmetry that this literature rarely names.

The taxpayer’s appraiser works under Standards 1 and 2 of the Uniform Standards of Professional Appraisal Practice, which govern the development and reporting of a single property appraisal. The assessor works under Standard 6, Mass Appraisal, Development and Reporting. Standard 6 permits model-based valuation of groups of properties, which is what a cost schedule is, and it carries the Jurisdictional Exception Rule, under which a state statute that would make compliance unlawful overrides the requirement.

That is why the two sides are not doing the same exercise, and it is why the taxpayer’s strongest lever exists. The mass appraisal standard’s own concession is that the depreciation estimate must be tested against market evidence: the check has to rest on non-cost data, primarily sales. A schedule that has never been tested against a hangar sale in the jurisdiction is a model whose depreciation component has not been validated in the way the assessor’s own standard requires. The argument in Section 5.3 is an argument about the assessor’s compliance with the assessor’s standard, not a preference for a different approach.

6. Burden of Proof

6.1 The General Rule

An assessment is presumed correct and the taxpayer bears the burden of displacing it. The New Jersey Supreme Court stated the standard in 1985: the original assessment carries a presumption of validity, and the taxpayer must present evidence definite, positive, and certain in quality and quantity to overcome it. The taxpayer has not met the burden unless the evidence is sufficient to establish a true valuation, not merely to contradict the assessor's. The court added that deficiencies in assessment methodology alone, without strong evidence that the assessed quantum is far removed from true value, will not defeat the presumption.

That last sentence is the one to absorb. Demonstrating that the assessor used a crude method is not enough. The record has to produce a supportable alternative value.

6.2 Where the Burden Shifts

Three mechanisms shift it, and a taxpayer who does not check for them may carry a burden the law does not impose.

A qualifying appraisal. Texas places the burden on the appraisal district to establish value by a preponderance of the evidence in a protest on value or unequal appraisal. Where the owner submits a certified appraisal supporting the owner's value on property appraised at one million dollars or less, the district must establish value by clear and convincing evidence. The same elevated standard applies where the appraised value was lowered in the preceding tax year and the owner files the required information within the statutory period. The burden returns to the owner where the owner failed to render or to respond to an information request.

An increase threshold. Indiana places the burden on the assessor where the assessment under review is an increase of more than five percent over the prior year's assessment for the same property. The governing section is 6-1.1-15-20, added in 2022, which replaced the repealed 6-1.1-15-17.2 that practitioners still cite. It provides that the assessment as last determined is presumed equal to true tax value until rebutted, that the presumption falls and the assessing official carries the burden where the increase exceeds five percent, and that where the evidence is insufficient to determine true tax value in an appeal governed by that subsection, the prior year assessment is presumed to be the true tax value. Where the taxpayer prevailed on an appeal of an increased assessment, the protection is different and is often misdescribed. It is a freeze rather than a burden shift: for residential and commercial property assessed at three million dollars or less, the assessing official may not increase the assessed value until the first year of the next four-year cyclical assessment cycle, subject to annual adjustment factors, and during that protection period the burden-shifting provision does not apply. Exceptions run to settlement agreements, error corrections, and sales at fair market value. The shift does not apply where the increase reflects substantial renovations, new improvements, zoning, or uses not previously considered.

The character of the taxing provision. Michigan's court of appeals held in a published decision of 13 March 2025, in a hangar case, that the lessee-user statute imposes a tax only on a lessee of tax-exempt property used in connection with a business conducted for profit, that the language must be strictly construed in favor of the taxpayer, and that the taxing authority rather than the taxpayer bears the burden of proving the tax applies. That canon is not universal and a practitioner should check which one the forum applies. Ohio moved the other way in 2023, abandoning the rule that exemption statutes are strictly construed against the taxpayer and holding that tax statutes must be read “through a clear lens, not one favoring tax collection,” applying the same rules of construction to tax statutes as to all others. The Michigan canon runs in favour of the taxpayer on a tax-imposing statute; the Ohio canon now runs neutrally on an exempting one. The tribunal had applied the wrong burden; the decision was vacated and remanded. The case was pending in the Michigan Supreme Court as of the date of this paper, and anyone relying on the court of appeals holding should check the docket.

6.3 When the Assessor Submits Nothing

The answers differ and it is worth knowing which applies.

Indiana supplies a statutory result. Where the burden has shifted and neither party carries it, the assessment reverts to the prior year's assessment. Indiana's board also follows the ordinary prima facie pattern, finding for the petitioner where the petitioner establishes a prima facie case and the respondent fails to rebut it, a pattern visible across the state's airport exemption decisions.

New Jersey is stricter. Under the 1985 standard an unrebutted taxpayer appraisal is not automatically dispositive. It must be definite, positive, and certain enough to establish a true valuation on its own.

7. Building the Record

7.1 Comparables

Hangars are not fungible across fields. Access, based aircraft mix, runway length, fuel availability, and the sponsor's rate structure differ enough that a hangar at a different airport twelve miles away is frequently not comparable at all.

California's rule for possessory interest comparables states the same-airport argument in regulatory form, which is useful precisely because hangars trade thinly. Comparables must be located sufficiently near the subject and sufficiently alike in character, size, situation, usability, zoning or other enforceable governmental restrictions on use, and restrictions on possession or use contained in the legal authorization or instrument that created, extended, or renewed the possessory interest. The rule also fixes a limit on recency, providing that near in time to the valuation date does not include any sale more than ninety days after the valuation date.

Sales of possessory interests themselves are contemplated as evidence. Value may be determined using the sale price of the subject interest or of comparable interests, subject to three adjustments: adding the present value of unpaid future contract rent for the term, adding the fair market value of debt assumed, and adding the present value of future costs the buyer must bear such as site restoration, less the present value of future benefits such as salvage or reimbursement for improvements at the end of the term. Comparable possessory interest sale prices are separately evidence of the reasonably anticipated term.

Where genuine sales or leases exist at the subject field, they carry the case. Where they do not, say so and build on income and obsolescence instead. Boards respond badly to comparables that are obviously reaching, and one weak comparable can cost the credibility of the rest of the presentation.

7.2 Income

Where the building is leased or subleased, actual rent, actual vacancy, and actual operating expenses are stronger evidence than any narrative about the market.

California's income provision is the most explicit ad valorem authority on the market versus contract rent distinction and repays reading even outside California. The income to be capitalized may be based on estimated economic rent for the subject interest, or, only if estimated economic rent is unreliable or unavailable, on the estimated net operating income of a typical prudent operator. The rule states its preference and the reason: rental income is preferable to operating income because operating income may be influenced by managerial skills and may derive in part from nontaxable property. Economic rent may be estimated from the subject's contract rent, from contract rents for comparable possessory interests, from contract rents for comparable fee simple interests, or from other comparable interests, but only where those rents were negotiated in an open and competitive market involving reasonably comparable property in physical attributes, location, legally enforceable use restrictions, term of possession, and risk of cancellation by the public owner.

Economic rent is separately defined as what would be paid if the rights to possession were offered in an open and competitive market and the public owner's interest were not exempt or immune from taxation, and it expressly excludes payments that are not consideration for rights in real property, giving rental of personal property, provision of security services, and advertising and promotional services as the examples. That exclusion is the mechanism for stripping fixed base operator service charges out of a hangar rent stream before capitalizing it.

Where the hangar is owner-occupied and the sponsor publishes its hangar rates, that schedule is usually obtainable and its authenticity is not in question. Its weight is a separate matter and should be anticipated rather than defended reactively. Published rates are asking rates, set under the sponsor's federal obligation to be fair and reasonable and as self-sustaining as circumstances permit rather than negotiated at arm's length, and an assessor can fairly argue they lag the market. A long waiting list cuts the same way, and the assessor will use it.

7.3 The Federal Overlay Does Not Reach Taxable Status

Federal grant obligations are frequently invoked in hangar appeals and they do less work than practitioners expect.

The federal hangar use policy published in June 2016 and effective July 2017 defines the aeronautical uses a sponsor may permit, including storage of active aircraft, final assembly of aircraft under construction, non-commercial construction of amateur-built or kit-built aircraft, and storage of aircraft handling equipment, and permits limited non-aeronautical storage where the items do not impede movement of the aircraft in and out of the hangar or access to it. The policy contains no discussion of property taxes or taxation of any kind. It addresses grant obligations, rental rates, and the sponsor's fair market value revenue requirements.

The honest use of it in an appeal is narrow and should be stated narrowly. The policy constrains what a sponsor may permit in a hangar and therefore constrains the legally permissible use an appraiser may assume, which is an evidentiary fact about highest and best use. It does not bear on taxable status, and no authority was located holding that federal obligation of the underlying land affects assessment.

There is one real instance of federal restriction driving tax treatment, and it is narrow. Indiana extends its public airport purpose exemption to leased property used for agricultural purposes located within the area that federal law and regulations restrict to aviation activities.

7.4 The Argument Nobody Has Made

Section 7.3 establishes that the federal overlay does not reach taxable status. It does reach something else, and the connection has not been drawn anywhere in the reported law.

FAA Order 5190.6C paragraph 17.9 provides that the reasonableness requirement of Grant Assurance 22 “takes precedence over the requirement for a self-sustaining rate structure with respect to aeronautical users,” that “the FAA does not consider the self-sustaining requirement to require the sponsor to charge fair market value rates to aeronautical users,” and that aeronautical fees for hangars and aviation offices “may be at a fair market rate, but are not required to be higher than a level that reflects the cost of services and facilities. In other words, those charges can be somewhere between cost and fair market value.”

Set that beside the California rule quoted in Section 7.2. Economic rent may be estimated from contract rent “only where those rents were negotiated in an open and competitive market.” An aeronautical ground or hangar rent set at cost recovery under paragraph 17.9 was not negotiated in an open and competitive market. It was set inside a federally sanctioned band whose floor is cost and whose ceiling is market, by a landlord under no obligation to reach the ceiling.

That is a direct argument against capitalising an aeronautical contract rent into assessed value, and it is available in every state whose rule conditions the use of contract rent on arm’s length negotiation. Colorado supplies the other half of the opening: under the valuation method the state Supreme Court set out for possessory interests, actual contract rents govern “unless it is shown” they are unrepresentative of market rates. Paragraph 17.9 is the showing.

No authority was located holding, or discussing, that a rent set under federal airport rate policy is not market rent for ad valorem purposes. That absence is reported here as a finding rather than as an invitation, because the argument cuts both ways and a practitioner should know it before making it. Paragraph 17.9 says aeronautical rates may be at a fair market rate. A sponsor that charges market rent has a market rent, and the taxpayer cannot then argue that regulation drove it down. The argument is available where the sponsor’s own rate documentation shows a cost basis, and not otherwise.

8. Uniformity Claims

A uniformity claim asserts that the subject is assessed at a higher ratio of value than comparable properties. It is a different case from a valuation case and it has its own authority.

The United States Supreme Court settled the remedy in 1923. Where a taxpayer's property alone is assessed at full value while comparable property is systematically undervalued, the right of the taxpayer whose property alone is taxed at one hundred percent of its true value is to have the assessment reduced to the percentage of that value at which others are taxed. The court reasoned that where it is impossible to secure both the standard of true value and the uniformity and equality required by law, the latter requirement is to be preferred as the just and ultimate purpose of the law, and it rejected the state's position that the under-assessed properties should be raised instead.

A 1989 decision applied the principle under the Equal Protection Clause to an assessor's practice of valuing recently sold property at its sale price while leaving unsold comparable property at stale values. A 1992 decision substantially confined that holding, distinguishing an acquisition-value system adopted as deliberate state policy from a single assessor's deviation from state law. Anyone building an equal protection claim should read both.

The evidentiary instrument is the ratio study. The governing standard is divided into a local assessment office part and an oversight agency part, and it addresses appraisal level and uniformity in both horizontal and vertical dimensions, stratification, outlier treatment, reliability measures, and direct and indirect equalization, with appendices covering sales validation, outlier trimming, median confidence intervals for small samples, the price-related bias measure of vertical equity, detection of sale chasing, and the legal aspects of such studies.

A currency note matters here. The operative version was approved in April 2013. A revised exposure draft went to members for comment beginning 1 May 2026, with substantial revisions to the vertical equity treatment and to the coefficient of dispersion ranges, and the association states that the 2013 version remains the recommended guidance until a final version is approved. A paper or report written now should cite the 2013 standard as operative and note that those two elements are in play.

Texas supplies a statutory unequal appraisal claim that is easier to run than a constitutional one: an unequal appraisal protest succeeds unless the district establishes that the subject's appraisal ratio is equal to or less than the median level for a reasonable sample of comparable properties.

9. Deadlines and Procedure

Appeal windows are short, they are usually jurisdictional, and they are unforgiving. The deadline frequently runs from the mailing of a notice that arrives looking like advertising. Building a strong record for a year that has already closed is the most common wasted effort in this area.

Concrete examples rather than a generic rule:

• California. An assessment appeal application must be filed within the period from 2 July to 15 September inclusive. The window extends to 30 November if the assessor fails to give notice of assessed values by 1 August, and a separate sixty-day window runs where notice was not given at least fifteen calendar days before the filing deadline, measured from the earlier of receipt of the notice or the mailing of the tax bill rather than from receipt alone.
• Ohio. A complaint must be filed on or before 31 March of the ensuing tax year, or the date of closing of the collection for the first half of real and public utility property taxes for the current tax year, whichever is later. Timeliness is enforced strictly, including a rule that a private meter postmark is not a valid postmark for determining whether a complaint was timely filed.
• Michigan. Tribunal jurisdiction over commercial, industrial, and developmental real property and commercial, industrial, and utility personal property is invoked by filing a written petition on or before 31 May of the tax year involved, and over agricultural, residential, and timber-cutover property on or before 31 July.
• Kansas. Where the route is payment under protest, the protest is filed at the time the taxes are actually paid; if paid before 20 December, no later than 20 December; and if an escrow agent paid before 20 December, no later than 31 January of the following year.

Two traps belong beside the deadlines because each has ended a hangar appeal on its own.

The first is the caption. In a 2025 Michigan matter a hangar appeal was dismissed outright because the petition named an entity that did not exist, the owner being one company and the petitioner another with a similar name. The tribunal refused to treat it as a misnomer, reasoning that ownership was itself central to the exemption claim and that the petitioner had been on notice of the defect for years. On a hangar appeal the petitioner’s exact legal identity is usually also an element of the merits, which is why the ordinary amendment latitude was not available.

The second is standing, which Ohio tightened in 2026. Complaints brought by legislative authorities, mayors and third parties are now conditioned on the property having sold at arm’s length within two years preceding the tax lien date at more than a stated threshold above true value, a legislative authority must adopt a resolution at a public meeting before authorising a complaint, and private payment agreements in exchange for withdrawal are barred.

Michigan's statute shows the jurisdictional character textually. Tribunal jurisdiction is invoked by filing on or before the stated date, so the filing is the jurisdictional act rather than a procedural step subject to extension. The same statute makes exhaustion jurisdictional as well: except as otherwise provided, the assessment must be protested before the board of review before the tribunal acquires jurisdiction.

The ladder itself is standard and the assessing standards prescribe it: an informal appeal, one or more levels of formal appeal, and a court of law. Informal review by the assessor is recommended because it allows a large number of owners to obtain information, state grievances, and resolve appeals simply and at low cost. The local or regional board is the first formal level and determines value or classification, rules on equity and uniformity, and considers exemption claims. The state tribunal should be the final administrative arbiter. Courts follow after administrative remedies are exhausted, with matters of valuation and fact addressed administratively and matters of law in court. Real examples track the structure: board of review to state tax tribunal to court of appeals in Michigan; county board of revision to board of tax appeals to the state supreme court in Ohio; county assessing board to state board of tax review to tax court in Indiana; assessor to county appeals board to superior court in California.

Payment under protest is a genuine prerequisite in some states rather than a formality. Kansas is the clearest, with a statutory payment-under-protest route and a bar on using it where the owner already appealed the valuation notice on the same property for the same year, so the two routes are alternatives rather than cumulative. Montana has an analogous provision. Confirm the local rule rather than assuming one.

The assessing standards also direct that appeal deadlines, operating procedures, rules, and regulations be published, that the assessor provide under oath copies of the original assessment, ratio study data where applicable, and any previous decision, and that all issues and principal arguments be disclosed before the formal hearing.

10. What the Hangar Cases Hold

Reported hangar decisions exist in at least six states. They split on materially similar facts, and the split is instructive rather than embarrassing, because every one of them turns on the lease.

Arizona. A 1997 court of appeals decision involved an air carrier and a fixed base operator that each leased land at a major commercial airport and built hangars and maintenance facilities. The court held the improvements were possessory interests assessed at one percent of full cash value rather than commercial property at twenty-five percent, because the leases restricted control and disposal and the improvements reverted to the city on termination. Its formulation is the test: the essential attributes of ownership are the rights in the owner to control, handle, and dispose of the thing owned. A 1999 decision applied the same analysis to air services improvements at a municipal airport. The lease provisions it recited, requiring city approval of building specifications, restricting transfer without consent, and mandating reversion, are the facts of the 1997 case rather than of the 1999 record. The 1999 holding rests on a different provision, an express clause vesting title to all improvements in the lessor on expiration or termination, from which the court concluded that the lessee did not own the improvements it occupied. It added the converse: improvements a lessee has full authority to control or destroy need not be made subject to the possessory interest tax, because they are already taxable.

Utah. A 1987 state supreme court decision reached the opposite result on comparable facts. Fixed base operators held concessions at a major airport providing tie-down and hangar storage, aircraft sales, flight training, and ramp services. The court held improvements built by the operators on city-owned land were taxable to the operators rather than exempt as city property, and it rejected the formal fixtures doctrine that would have vested title in the city. It adopted a most-significant-incidents-of-ownership test and found the operators built their own improvements from their own plans, had full use, enjoyment, and profit from them, maintained them at their own cost, claimed depreciation deductions, and could remove them on city default. Economic reality rather than legal title determined taxability.

Michigan. A 1984 decision involved a hangar constructed by a lessee under a twenty-year lease with a five-year renewal option at a municipal airport. The court held the hangar was real property belonging to the airport rather than personal property of the lessee, because title vested in the lessor under the lease and the lessor retained the bulk of the rights of ownership, including control over improvements, operations, and rent adjustments, notwithstanding the lessee's power to mortgage the structure. The lessee therefore qualified as a concessionaire within the statutory exemption for property used as a concession at a public airport. A 2017 tax tribunal decision reached the mirror image. A hangar facility carried on the roll as a building on leased land was exempt as property of a political subdivision, yet the lessee remained taxable under the lessee-user statute because the subletting arrangement did not qualify as a tax-exempt concession. The 2025 court of appeals decision discussed in Section 6.2 involved a tenant who leased land at a regional airport and built a hangar on it; the exemption for property owned by the airport commission was upheld, and the lessee-user determination was vacated on the burden of proof. The central question was whether storing a privately owned airplane in a hangar leased from a public airport constituted taxable commercial use.

A 1994 decision cuts the other way and belongs beside it. Three lessee-built hangars and an office at another Michigan airport were subleased to an airline for maintenance, and the tribunal allowed the concession exemption. The court of appeals reversed that part, holding that the exemption requires the property to be used as a concession and to be available for use by the general public. A hangar used only for maintenance failed the second limb. The two decisions together mean the Michigan concession exemption turns on public availability rather than on who built the building.

Ohio. A 2021 state supreme court decision involving a university airport held the entire parcel exempt under the statute covering state university property. On hangars specifically the court held that an ancillary use of property that generates income does not defeat exemption as long as it relates operationally to university activities, that the statute contains no exclusive-use limitation and encompasses receipt of income from ancillary activities, and that income from leased hangars, offices, and facilities need not be split-listed. A dissent argued that a separate statute mandates split-listing.

Indiana. The state's board of tax review has decided a series of airport exemption cases. An airport manager's residence on airport property was held fully exempt under the provision covering improvements leased from an airport authority, the board noting that the provision does not address financing and simply requires that the property or improvement be leased from an airport authority, so the petitioners' personal mortgage was irrelevant. A privately owned, public-use airport was held fully exempt, the board holding that the statute does not distinguish between for-profit and not-for-profit entities, so that a property owner's for-profit status does not disqualify its property and the manner of use governs. A 33,920 square foot building at a general aviation airport leased to an insurance company and to an aircraft business was held 99.9947 percent exempt under the hangar provision and a companion provision covering aviation-related property used by a lessee providing services or accommodations, including fixed base operations. A 2,027 square foot terminal restaurant was held to qualify as reasonably necessary to and used for public airport purposes because it provides basic facilities to the traveling public, over the assessor's argument that it did not meet the federal definition of a fixed base operator, with the board applying a predominant use test. And in a further case a private owner-operator made a prima facie case for all property except a forest area and a dwelling with its homesite, with the respondent failing to rebut.

Florida. A 2019 attorney general opinion concluded that a city's leasing of hangar spaces at its municipal airport to private aircraft owners for noncommercial storage is exempt from ad valorem tax. The state exempts leasehold interests in governmental property only where the lessee serves or performs a governmental, municipal, or public purpose, and deems activities public-purpose when they could properly be performed or served by an appropriate governmental unit. The opinion reasoned that noncommercial aircraft storage is a basic airport function that federal aviation requirements oblige municipalities to provide, and noted that the exemption fails if the lessee engages in commercial for-profit operations.

No hangar decision was located from the Minnesota tax court, the Washington board of tax appeals, the New Jersey tax court, or the California appeals boards. The Minnesota and Washington absences are likely explained by their statutes resolving the question before it becomes a dispute. No reported decision addressing a fabric or portable hangar was located, which is notable because removability is the very factor that decides the Utah and Arizona cases.

The portable practice point is the one the cases share. Every one of them was decided on lease terms: who holds title during the term, whether improvements revert, whether the lessee may remove, mortgage, assign, or destroy them, whether the lessor approves specifications and sublessees, and whether the lessee claims depreciation. None was decided on square footage, door type, or condition. The property record card fixes arithmetic. The ground lease decides who is taxed and on what.

11. The Decided Record

Section 10 describes what the hangar cases hold. This section lists them, because the descriptions are of limited use to a practitioner who needs a citation, and because the pattern across seventeen decisions is more instructive than any one of them.

11.1 What the Pattern Shows

Three things are visible in the list that are not visible in any single case.

The taxpayer wins on characterisation and loses on value. Every taxpayer win in the table turns on who owns the improvement, what class the interest falls in, or which statute applies. Where the argument is that the hangar is worth less than the assessor says, the taxpayer loses. Two Traverse City petitioners argued a taxable value of zero and the tribunal found $60,700 and $217,607. A zero contention is not a valuation argument, and a tribunal handed one has no evidentiary basis on which to find anything but the assessor’s number.

The same airport produces repeat litigation. Four of the seventeen come from Cherry Capital in Traverse City, decided across four years on the same statutes, and they have not produced a settled answer: one dismissal on jurisdiction, two assessor wins on value, one taxpayer win on burden that vacated and remanded. A hangar owner at a field where this has been litigated should read the local docket before the treatises.

And the Colorado line has moved. Section 3.1 describes Colorado as a value-based interest tax state, which is right for concession and use interests and wrong for a tenant-built hangar. Rare Air holds that where the tenant owns the improvement, the possessory interest statute does not apply at all: the hangar is assessed as real property at actual value, and the tenant is the owner. The court was explicit that the statute “does not provide the authority for taxation of possessory interests nor does it dictate whether an interest is taxable,” and that the unit assessment rule “has no application when separate and distinct interests in the property exist.” The assessor valued a hangar built for about $2.4 million at $2,871,708. A practitioner who arrives at a Colorado hangar appeal expecting to capitalise a thirty-five cent ground rent will lose the way that taxpayer lost.

11.2 The Indiana Determinations, Named

Section 10 describes five Indiana Board of Tax Review determinations without naming them, which makes them unusable as citations. They are named in the Department of Local Government Finance’s own training materials: the airport manager residence case is Montgomery v. Boone County PTABOA (2009); the privately owned public-use airport held fully exempt is Steinle v. Newton County (2009); the 33,920 square foot building held 99.9947 percent exempt is Lake County Trust Company v. Lake County (2007); the terminal restaurant case is Lake County Trust Company v. Lake County (2023); and the owner-operator case is Davidson v. Jefferson County PTABOA (2006). The predicate authority for the airport authority exemption is Bailey v. Evansville-Vanderburgh County Airport Authority District, 240 Ind. 401 (1960), holding that an airport authority district is a municipal corporation.

Petition numbers are not given in the department’s materials and the board’s determination indexes are organised by month without full-text search. The figures above trace to the department’s account rather than to the determinations themselves, and anyone relying on a dollar-precision figure should pull the determination.

12. Limitations

This paper is general information for professionals evaluating aviation real estate. It is not appraisal, legal, or tax advice, it does not create an engagement, and appeal procedures and deadlines vary by jurisdiction and change.

The state treatments in Section 3 are established from statutory and regulatory text for the states named. They are not a survey of all fifty states, and a state not named here should not be assumed to follow any of the four patterns.

The cost service occupancy descriptions in Section 5.2 come from a 2011 reference guide rather than a current subscription edition. Occupancy numbering has been stable but no current section, page, or cost figure is asserted.

No error rate for assessor records is reported because no published study establishing one was located. Any figure a practitioner encounters should be traced to a named source before it is relied on.

Several citations in the underlying research carried parallel reporter references that could not be confirmed against official texts, and holdings rather than parallel citations are what this paper relies on. Anyone quoting a decision in a filing should retrieve the official text.

The Michigan burden of proof decision discussed in Sections 6.2 and 10 is pending on further review and may change.

The ratio study standard is under revision as described in Section 8. The treatise edition changed in 2026.

13. Conclusion

The order of operations decides the case. Establish what interest is being taxed, to whom, and under what measure, before valuing anything. That answer determines whether the lease is the central exhibit or an irrelevance, whether market rent is evidence or the statutory base, and whether an appraisal has any part to play at all.

Three corrections follow from the research. The unencumbered fee rule belongs to particular statutes and cases and not to the professional standards, which say the opposite about the term itself. Possessory interest describes four distinct regimes and the evidence that wins under one is inadmissible or pointless under another. And two states exclude hangars from the relevant tax by name, which a taxpayer paying it should verify before building any valuation case at all.

What survives all of that is the record. The property record card corrects factual error and is the cheapest relief available. The ground lease, in the states where the taxpayer's own interest is the assessable unit, is frequently the most persuasive document in the file and is frequently never produced. Obsolescence has to be identified and quantified rather than asserted. Comparables come from the same field or their absence is explained. And the burden of proof may already sit with the assessor, by statute in two states and by decision in a third, which is worth checking before shouldering it.

This paper is general information for professionals evaluating aviation real estate. It is not appraisal, legal, or tax advice, and it does not create an engagement. Appeal procedures and deadlines vary by jurisdiction.

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