Underwriting a Loan Against a Leasehold Hangar

Executive Summary

A hangar loan file often looks like any other owner-occupied commercial real-estate deal: a stabilized structure, a creditworthy borrower, a loan-to-value ratio inside policy. The problem is that at most general-aviation airports the borrower does not own the land, and frequently does not own the hangar in fee either. What secures the loan is a leasehold interest in improvements on ground-leased public land, and that interest behaves nothing like fee real estate. It is a wasting asset with a fixed expiration date, it can be terminated for a lease default the lender never sees, and at the end of the ground lease the improvements typically revert to the airport at no cost. A collateral analysis that treats the hangar as ordinary real estate, and sizes the loan accordingly, systematically understates the risk.

This paper reframes the appraiser’s reversion work as a credit question and walks through the four places the risk hides. First, remaining lease term against loan amortization: if the loan amortizes over a longer period than the lease has left to run, a portion of principal is still outstanding when the collateral reverts, an unsecured tail the pricing rarely reflects. Second, the reversion clause itself, which converts the hangar from an asset into a countdown. Third, the gap between leasehold and fee-simple value, which means a fee-based appraisal and a fee-based advance rate both overstate recovery. Fourth, the ground lease’s financeability: unless it grants the lender notice-and-cure rights, a new lease on foreclosure, and the right to mortgage and assign the leasehold without unreasonable consent, the collateral cannot be realized at all, and the airport sponsor is under no obligation to cooperate after the fact.

The SBA programs deserve their own treatment because they encode much of this discipline in rule, and because the rules changed recently. Under the current SOP 50 10 (Version 8, effective June 1, 2025), a 504 loan whose collateral is substantially leasehold requires that the remaining lease term, counting only renewal options the borrower can exercise unilaterally, equal or exceed the loan term; the 7(a) program states the same requirement as a “should” that hardens into a “must” if the lender cannot obtain an assignment of lease and a landlord’s waiver. A credit officer who understands why the generic advance rate is too generous, and who conditions the approval on a financeable ground lease and a leasehold appraisal, protects the institution and, not incidentally, knows exactly which appraiser to call for the interest that actually secures the loan.

1. Why Generic Collateral Analysis Understates the Risk

The standard owner-occupied real-estate template assumes a durable asset: a building on land the borrower owns, whose value at any point in the loan is a function of the market, not the calendar. A ground-leased hangar breaks three of those assumptions at once. The borrower usually holds only a leasehold, so the collateral is a contract right of finite duration rather than a fee estate. The improvements revert to the airport at lease end, so the asset’s value declines toward zero as the expiration date approaches, regardless of market conditions. And the leasehold can be forfeited if the borrower defaults under the ground lease, an event outside the loan documents that the lender may not even learn of unless the lease requires separate notice to the leasehold mortgagee.

The practical effect is that three numbers a credit officer relies on are each biased in the same optimistic direction. The appraised value, if it reports fee-simple or leased-fee value rather than the leasehold interest, is too high. The advance rate, if it is the institution’s standard real-estate percentage, is applied to the wrong base. And the amortization term, if it is set to the collateral’s physical life rather than the lease’s remaining term, extends the loan past the point at which the collateral still exists. Table 1 sets the generic assumption against the leasehold reality.

Table 1. Where the generic template misreads a ground-leased hangar

Each row biases recovery in the same direction, so the errors compound rather than offset.

2. Remaining Lease Term Against Loan Amortization

The first and most quantifiable risk is a maturity mismatch between the loan and the lease. A fully amortizing loan retires principal on a schedule set by its amortization term. The collateral, by contrast, has a hard stop at the ground lease’s expiration, when the improvements revert. If the amortization term runs longer than the remaining lease term, there is a window at the end of the loan during which principal is still outstanding but the collateral has already reverted to the airport. That window is an unsecured tail, and its size is a function of how far the amortization outruns the lease.

The arithmetic is unforgiving because amortization is back-loaded: early payments are mostly interest, so principal remains high well into the schedule. Consider a hypothetical $1,000,000 loan at 7.5% interest. On a 20-year amortization, roughly $179,000 of principal, about 18% of the original balance, is still outstanding at year 18. On a 25-year amortization, about $482,000, nearly half the loan, remains at year 18, and $369,000 remains at year 20. If the ground lease has only 20 years left to run, a 25-year amortization leaves more than a third of the loan exposed at the moment the collateral disappears. Table 2 shows the outstanding balance at several reversion points.

Table 2. Illustrative unsecured tail: outstanding balance at reversion ($1,000,000 loan at 7.5%)

Figures are illustrative and computed on a standard monthly amortization; percentages are of the original balance. The lesson is structural, not rate-specific: any amortization longer than the remaining lease term leaves principal exposed when the collateral reverts.

The discipline that follows is to size amortization to the qualifying remaining lease term, not to the hangar’s construction quality or the borrower’s preferred payment. Two subtleties matter. The relevant term is the remaining term as of closing, net of any period already elapsed, and it is measured to the earlier of lease expiration or the first point at which the lessor can terminate at will. Renewal options extend the term only if the borrower can exercise them unilaterally; an option that the airport can decline, or that is contingent on the airport’s discretion, adds nothing a lender can count. A hangar with sixteen years left on its base term and a ten-year renewal exercisable at the airport’s option has sixteen countable years, not twenty-six.

Prudent practice adds a cushion beyond bare term-matching, so that the loan fully retires with room to spare before reversion and before the borrower faces a renewal negotiation from a position of weakness. There is no single universal figure. Institutional ground-lease practice and model forms build in large margins scaled to the lease length, and the closest bright-line analogue, Fannie Mae’s residential leasehold guideline, requires the lease to extend at least five years beyond loan maturity. That five-year figure is a residential-mortgage rule rather than a commercial or SBA mandate, but the principle it encodes, that the lease should outlast the loan by a margin rather than expire the day the last payment is due, is sound underwriting for a commercial hangar as well.

3. The Reversion Clause: Collateral That Extinguishes

The reason the maturity mismatch is fatal rather than merely inconvenient is the reversion clause. In a typical airport ground lease, the tenant builds and owns the hangar during the lease term, but title to the improvements passes to the airport at the expiration or termination of the lease, usually with no compensation to the tenant. As lender counsel summarize the standard structure, during the term the improvements remain the property of the tenant, but once the term expires the improvements on the land become the property of the landlord. The collateral, in other words, is contractually programmed to disappear on a known date.

This is why the reversion analysis that an appraiser performs for a tax or valuation assignment is, from the lender’s side of the table, a collateral-extinguishment schedule. Every year that passes moves the hangar closer to a value of zero as security, not because it deteriorates but because the number of years the lender could operate or re-let it after foreclosure shrinks. Two features of the clause deserve specific attention in credit review. The first is what triggers reversion: expiration is predictable, but many leases also vest the improvements in the airport on early termination for tenant default, which means a ground-lease default can hand the collateral to the airport free of the lender’s lien unless the lease protects the leasehold mortgagee. The second is whether any salvage or compensation is payable on reversion; most airport leases provide none, so the lender should assume the terminal collateral value is zero rather than a depreciated cost figure.

The companion papers in this series treated the same reversion clause as the fact that determines whether a hangar improvement is taxed to the tenant or swept into a possessory interest. Here it determines something more immediate for the lender: the date on which the security interest is worth nothing. A loan that is not fully amortized and de-risked before that date is, for its final stretch, effectively unsecured.

4. Leasehold Versus Fee Simple: Valuing the Actual Collateral

Because the collateral is a leasehold, the appraisal that supports the loan must value the leasehold, not the fee simple or the leased fee. These are different property interests with different values, and the difference is not a rounding error. The fee simple reflects perpetual ownership; the leasehold reflects only the right to use the improvements for the remaining term, burdened by the obligation to pay ground rent and stripped of any reversionary value. As the reversion date nears, the leasehold value falls even as a fee-simple valuation of the same physical hangar would hold steady. A lender that advances against a fee-simple or leased-fee appraisal is lending against value the borrower does not own.

Appraisal standards require the interest to be identified and valued as such. The Uniform Standards of Professional Appraisal Practice and the Interagency Appraisal and Evaluation Guidelines both require the appraiser to identify the specific real property interest being appraised, and the leasehold guidance is explicit that the appraiser must analyze and discuss what effect the terms, restrictions, and conditions of the ground lease have on the value and marketability of the subject, and must adjust any fee-simple comparables to reflect the different property rights conveyed. A credit officer reviewing the appraisal should confirm, on the first page of the report, that the interest appraised is the leasehold, that the remaining lease term and ground-rent obligation are stated, and that the comparables were adjusted for property rights rather than lifted from fee-simple hangar sales.

Two valuation wrinkles recur at airports. Where the borrower subleases part of the hangar, the interest to be valued may be a sandwich position, the borrower’s leasehold net of the subtenant’s rights, which is narrower still than a simple leasehold. And the ground-rent structure matters: a lease with fixed rent well below market carries a positive leasehold value from that spread, while a lease with escalating or market-reset rent may carry little leasehold value even mid-term. The prior refutation is worth stating plainly for underwriters, though: a leasehold is not valueless merely because its rent is at market, and it is not valuable only when rent is below market. Value can come from the improvements, the location, and the remaining term as well as from a rent spread, so the appraisal, not a rule of thumb, should establish it. What the credit officer takes from all this is that leasehold loan-to-value and loan tenor both need to be tighter than the fee-simple defaults, because the base they apply to is smaller and shrinking.

5. Financeability: The Ground-Lease Provisions That Make the Collateral Real

All of the foregoing assumes the lender can actually realize on the leasehold if the borrower defaults. That assumption holds only if the ground lease is financeable, meaning it contains the protections a leasehold mortgagee needs to preserve and take over the collateral. An otherwise attractive hangar on an unfinanceable ground lease is, for lending purposes, close to worthless as security, because the lender cannot step in to cure, cannot foreclose cleanly, and cannot transfer the leasehold to a replacement operator. Financeability is therefore not a documentation nicety; it is the condition on which the collateral’s value depends.

The core protections are well settled in ground-lease practice, and a credit officer should treat their absence as a structural defect rather than a negotiating point to be conceded. The lender needs independent notice of any tenant default under the ground lease and a reasonable period, typically at least thirty days, to cure the default, take over the tenant’s rights, or begin foreclosure, so that a curable lease default does not forfeit the collateral before the lender can act. The lender needs the right to cure on the tenant’s behalf. And critically, the lender needs the right, on foreclosure or on termination of the lease, to obtain a new lease covering the same premises for the remainder of the original term, so that a termination does not simply extinguish the estate the lender is lending against. The lease must also permit the leasehold to be mortgaged and assigned without the lessor’s unreasonable consent; a lease that restricts or prohibits mortgaging the tenant’s interest cannot support leasehold financing at all.

Table 3. Financeable ground-lease checklist for a leasehold hangar

These provisions are standard in institutional ground-lease practice. The magnitude of specific figures (for example, the cure period) is negotiable, but the presence of each protection is not.

6. Where SBA 504 and 7(a) Structures Get Tricky

SBA lending encodes much of this discipline into program rule, which is a benefit when the rules are understood and a trap when they are not. The governing authority is the SBA’s Standard Operating Procedure 50 10, and the operative version changed recently: Version 8 took effect June 1, 2025, and it revised the leased-property provisions that had themselves been narrowed by a December 2023 procedural notice. A credit officer working an SBA hangar file should verify the text in force at origination, because this is a fast-moving instrument and SBA has been issuing loan-by-loan waivers of the lease-term policy pending further revision.

6.1 The lease-term-matching rule, and how options are counted

The rule that matters most for a ground-leased hangar is that the lease term must be long enough to cover the loan. Under SOP 50 10 8, when a substantial portion of the deal is leasehold, defined as the lesser of $500,000 or 30% of loan proceeds funding leasehold improvements, or the lesser of $500,000 or 30% of the collateral consisting of leasehold improvements, fixtures, machinery, or equipment attached to leased real estate, the lender must obtain the written lease and should obtain an assignment of lease and a landlord’s waiver. For a 504 loan, the lease term, including renewal options exercisable only by the borrower, must equal or exceed the term of the loan. For a 7(a) loan the requirement is phrased as a “should,” but it hardens into a “must” if the lender cannot obtain the assignment of lease and landlord’s waiver. The single most common error is counting renewal options that the borrower cannot exercise unilaterally; options subject to the airport’s consent or discretion do not count toward the qualifying term, which is precisely the kind of option airport leases tend to contain.

Because the 504 debenture terms for real estate run twenty or twenty-five years, and the debenture term is tied to the useful economic life of the financed asset, a 504-financed hangar on a ground lease needs a remaining term, counting only borrower-exercisable options, of twenty to twenty-five years. Many airport ground leases do not have that much runway left by the time a hangar changes hands. A hangar whose ground lease expires in 2049 has roughly twenty-three years remaining as of 2026, which is short of a twenty-five-year debenture unless a borrower-exercisable extension closes the gap. This is where a deal that pencils on cash flow can fail on collateral term, and where the SBA waiver process becomes relevant.

6.2 Occupancy, collateral, and appraisal under the SBA rules

Three further SBA requirements shape a hangar deal. Occupancy: the owner-occupancy rules require the borrower to occupy at least 51% of an existing building or 60% of new construction at the outset, rising toward 80% over ten years for new construction, and where 504 funds improve the leasehold the borrower must occupy 100% of the improved space. A hangar the borrower intends to sublease heavily can run afoul of this. Collateral perfection: an SBA loan on leased land is secured by a recorded leasehold mortgage or deed of trust on the borrower’s leasehold interest, supported by the landlord’s written consent to that mortgage and a collateral assignment of the ground lease, with title insurance on the leasehold position, which is simply the SBA making financeability mandatory. Appraisal: for 7(a) an appraisal by a state-licensed or certified appraiser is required whenever loan proceeds acquire, refinance, or improve the commercial real estate securing the loan, regardless of size; for 504 an appraisal is required when the property value is $500,000 or more, and a state-certified appraiser is required at $1,000,000 or above. The appraisal must comply with USPAP, and when the lender values the collateral it must exclude the contributory value of rental income and intangible assets, which for a hangar means the analysis rests on the leasehold real estate itself rather than on sublease income streams.

The through-line is that the SBA rules, read carefully, are a codification of the same three defenses a prudent conventional lender would build anyway: match amortization to a countable lease term, perfect a financeable leasehold mortgage with the lessor’s consent, and appraise the leasehold interest specifically. The traps are in the details, the option-counting rule, the debenture-term-versus-lease-term arithmetic, the occupancy thresholds, and the fact that the operative SOP language moves, so a file assembled to last year’s version can miss.

7. Airport and FAA Overlays

One layer sits above even a well-drafted ground lease: the airport is a federally obligated entity, and its leases are subordinate to its grant assurances to the FAA. FAA Grant Assurance 5 prohibits an airport sponsor from granting a tenant a property interest that would restrict the sponsor’s ability to preserve its rights and powers to operate the airport. In practice, sponsors comply by keeping ground-lease terms under fifty years, consulting the FAA on any longer term, and subordinating the lease to the grant assurances, which means the leasehold a lender takes as collateral is itself junior to a federal overlay the lender cannot alter. The duration of the sponsor’s grant-assurance obligations depends on the type of recipient and the useful life of the federally funded facilities, so it is not a fixed date the lender can plan around.

The sharper point for a leasehold lender is consent to transfer. FAA minimum-standards guidance advises that an airport sponsor is under no obligation to accept a proposed assignment or sale of an agreement, and encourages sponsors to prohibit assignment outright. That guidance addresses through-the-fence access agreements directly, but the consent-to-assignment principle applies to on-airport ground leases as well, and it means a lender cannot assume it will be able to foreclose and transfer the leasehold to a new operator without the airport’s cooperation. The defense is to obtain that cooperation up front rather than hope for it later: a consent and estoppel from the airport sponsor recognizing the leasehold mortgage, agreeing to notice-and-cure and to a new lease on foreclosure, and confirming the sponsor will not unreasonably withhold consent to an assignment to the lender or its designee. Absent such an agreement, the airport overlay can strand the collateral in the lender’s hands even after a clean foreclosure.

8. Practical Underwriting Mechanics

The analysis converts into a short set of conditions a credit officer can attach to a leasehold hangar approval. None is exotic; the value is in applying them before closing rather than discovering their absence in a workout.

Size amortization to the countable remaining lease term, not the hangar’s physical life, and add a cushion so the loan retires before reversion and before any renewal negotiation. Count renewal options only if the borrower can exercise them unilaterally.

Order a leasehold appraisal, and confirm on review that the interest appraised is the leasehold, that the remaining term and ground rent are stated, and that comparables were adjusted for property rights rather than taken from fee-simple sales.

Read the reversion clause and treat terminal collateral value as zero absent a contractual salvage or compensation right. Note whether early termination for tenant default also vests the improvements in the airport.

Condition the loan on a financeable ground lease: right to mortgage without unreasonable consent, separate notice of default to the leasehold mortgagee, at least thirty days to cure, a new lease on termination for the balance of the original term, and rights to insurance and condemnation proceeds.

Obtain a leasehold-mortgagee consent and estoppel from both the ground lessor and, where distinct, the airport sponsor, addressing notice-and-cure, new lease on foreclosure, and consent to assignment to the lender or its designee.

For SBA files, verify the SOP version in force, run the option-counting and debenture-term-versus-lease-term test explicitly, confirm occupancy compliance, and perfect the leasehold mortgage with the lessor’s written consent and a collateral assignment of the ground lease.

Monitor lease compliance over the life of the loan: ground-rent payment, insurance, and any renewal-option exercise deadlines, since a missed borrower option can shorten the countable term after closing.

The last word is a referral point rather than a credit one. The single input that resolves most of the uncertainty above is a competent appraisal of the leasehold interest, performed by someone who values the reversion, the ground-rent burden, and the remaining term rather than the physical hangar. A credit officer who insists on that appraisal is not adding cost; they are pricing the collateral they actually hold, and building the file that survives examination and workout alike.

Authorities and Sources

SBA program authority

SBA Standard Operating Procedure 50 10, Version 8 (effective June 1, 2025); prior Version 7.1 (effective Nov. 15, 2023); sba.gov.

SBA Procedural Notice 5000-852522 (Dec. 2023), narrowing the lease-term-matching requirement.

13 CFR Part 120, including §120.131 (owner-occupancy); ecfr.gov.

SBA SOP 50 10 8 Technical Updates (May 2025), “Responsibilities When the Borrower is Leasing Space.”

Ground-lease financeability and appraisal

Fannie Mae Selling Guide B2-3-03 (leasehold estates) and B4-1.4-05 (leasehold interests appraisal requirements), used by analogy for the financeability and interest-appraised principles.

Uniform Standards of Professional Appraisal Practice; Interagency Appraisal and Evaluation Guidelines (identification of the interest appraised).

ICSC, Leasehold Financing model materials; Thompson Coburn, “Key Issues in Negotiating Financeable Ground Leases”; Starfield & Smith, best-practices notes on SBA leased-land lending and appraisal requirements; Coleman Report; Great Lakes Commercial Finance.

Airport and FAA

FAA Grant Assurance 5 (Sponsor Assurances, 2025); faa.gov/airports/aip/grant_assurances.

FAA Advisory Circular 150/5190-8, Minimum Standards, §1.4.2.2 (assignment of agreements).

ACRP / National Academies Report 27990 (airport ground-lease terms and Grant Assurance 5 compliance).

Companion papers

Aeronautical Valuation Research Series: “Property-Tax Assessment of Aircraft Hangars” and the hangar transfer-tax paper (estate and gift), which develop the reversion and leasehold-versus-fee analysis relied on here.

Disclaimer. This paper is a research synthesis for lending and appraisal professionals and is not legal, tax, or credit advice. SBA SOP 50 10 is revised frequently and its provisions may be waived case by case; the operative version and text in force at origination govern. Financeability and appraisal principles here draw on ground-lease practice materials and residential GSE guidelines by analogy and should be confirmed against the institution’s own policy, the specific ground lease, and current SBA guidance before application to a transaction.

This paper is research and general information for professionals evaluating aviation real estate. It is not appraisal, legal, or tax advice, and it does not create an engagement.