Multifamily Feasibility Study: Demand, Rents, Lease-Up and Financing

A multifamily feasibility study tells a lender whether one specific apartment project, on one specific site, can lease its units at supportable rents fast enough, and hold them long enough, to pay its operating costs and its debt at the coverage the capital source requires. It answers with evidence from the primary market area rather than a national rule of thumb, because apartments compete block by block and the next building down the road can take the renters a pro forma counted on.

Four facts shape almost every apartment loan file today:

• The pipeline is still large. At the end of September 2026, 678,000 units in buildings with five or more units were under construction in the United States, and another 120,600 were authorized but not started [1][2].
• Vacancy has drifted up. The rental vacancy rate for units in buildings with five or more units was 8.9% in the third quarter of 2026, against 8.0% for the year 2019 [3][4].
• Building takes longer. Buildings with 20 or more units took an average of 19.1 months from start to completion in 2025, against 17.2 months in 2019 [5].
• Program rules cap the lease-up. HUD's guide says the absorption period for new construction "should not exceed 18 months from delivery of the first units" unless a waiver applies [6].

This page sets out what the study must prove, the federal data it draws on, how each capital source reads it, and what it costs. Every study ends in one of three conclusions: feasible as proposed; feasible with stated conditions, such as a smaller loan, a larger interest or lease-up reserve, a different unit mix or a later delivery date; or not feasible as proposed, with the changes that would make it work. For state detail, see the multifamily feasibility study for Texas and the other state pages; for how agency and HUD market studies differ, see agency multifamily versus HUD market studies; for a building with commercial space at the base, see the mixed-use feasibility study.

What is a multifamily feasibility study?

It is an independent analysis, written for a lender's or agency's file, of whether a proposed or existing apartment property can support its financing. The demand half is usually called a market study. HUD's guide states the purpose of a market study plainly: "to assure that there is enough sustainable demand for additional units without adversely impacting the existing supply" [6]. A feasibility study contains that market study and continues into the development budget, the financing, coverage through lease-up and at stabilization, and an explicit conclusion.

The two documents answer different questions, and both differ from an appraisal. An appraisal estimates value at a date. Federal banking rules require an appraisal by a state certified appraiser for federally related commercial real estate transactions above $500,000 and for all such transactions of $1,000,000 or more [7]. A market study or feasibility study holds no opinion of value; where the lender needs one, it comes from a separately engaged appraiser, and HUD requires the market analyst's rents to be reconciled with the appraiser's [6].

Exhibit 1. Market study, feasibility study and appraisal compared

Source: HUD MAP Guide, Chapter 7; HUD Mortgagee Letter 2025-03; 7 CFR Parts 3560 and 3565; 12 CFR 34.43, as cited in each row. Comparison by FSC.

A lender may call the document a market study, a market analysis or a feasibility study. The label matters less than the scope. The study is built to the strictest set of requirements among the capital sources actually in play, and the report says which standard it follows.

What does a lender need the study to prove?

A lender needs proof that the property's own rent roll will cover operating costs and debt service under the program's rules, during lease-up and after it. USDA's guaranteed rental housing rule is the most explicit federal statement of what a lender must weigh. It lists eleven factors the approved lender must address when it originates the loan and appraises the property [9]. They are a sound checklist for any apartment loan.

Exhibit 2. The eleven loan standards in 7 CFR 3565.301 and what the study supplies

Source: 7 CFR 3565.301, Loan standards (revised as of January 1, 2026) [9]. Right-hand column by FSC.

HUD sets a similar bar for its own programs. Its guide says a market study's effective date must fall within 120 days before a pre-application is submitted and within 180 days before a firm commitment is issued, and that "Projects with insufficient demand for the units at the proposed rents should be rejected" [6]. That last sentence is the standard the study is written against: not whether demand exists somewhere, but whether it exists for these units at these rents.

How large is the renter market the study draws on?

Large, and close to half of it lives in buildings of five or more units. The 2025 American Community Survey counted 46,551,688 renter-occupied households in the United States, 34.7% of all occupied units [11]. Of those renters, 22,584,884 lived in buildings with five or more units [12].

Exhibit 3. U.S. rental market indicators, 2025

Source: U.S. Census Bureau, American Community Survey 2025 1-year estimates, Tables B25003, B25032, B25064, B19013 and B25070; Current Population Survey/Housing Vacancy Survey, Table 5. Shares calculated by FSC.

Exhibit 4. Renter households by units in structure, 2025

Source: U.S. Census Bureau, American Community Survey 2025 1-year estimates, Table B25032, Tenure by Units in Structure, United States [12][16]. Shares calculated by FSC.

These are national counts. A study works from the same tables for the primary market area, because the renter share, the income profile and the building stock vary widely between a downtown, a suburb and a small town. Single-family houses hold 30.8% of renters nationally, which is why a build-to-rent community and a mid-rise apartment building can draw on overlapping but different renter pools.

How much new apartment supply is coming?

A great deal is still under construction, even though starts fell from their 2022 peak. Units started in buildings with five or more units reached 531,000 in 2022, the high point of 2019 to 2025, and were 396,900 in 2025 [17]. Completions peaked two years after the starts did: 591,700 units in 2024, the most in the years shown here, then 467,700 in 2025 [18].

Exhibit 5. The U.S. pipeline for buildings with 5 or more units

Source: U.S. Census Bureau, Building Permits Survey, state annual files st2019a to st2025a, United States row [19][20][21][22][23][24][25]; New Residential Construction, units started, completed, under construction and authorized but not started, not seasonally adjusted [17][18][1][2].

The national picture is only a backdrop. Permits concentrate in a short list of metro areas, and a project in one of them faces a very different delivery wave from one in a market with little new building.

Exhibit 6. Metro areas with the most units authorized in 5+ unit buildings, 2025

Source: U.S. Census Bureau, Building Permits Survey, CBSA annual file cbsa2025a and state annual file st2025a [26][25]. Value per unit calculated by FSC from the reported permit valuation; it is construction value on the permit, not total development cost.

These ten metro areas account for 162,379 units, or 35.0% of the national total. A study in any of them counts competing projects one by one, because the metro total says little about the submarket the subject will lease in.

How long does a permit take to become competing supply?

Longer than it used to. In buildings with 20 or more units, the average time from start to completion rose from 17.2 months in 2019 to 19.1 months in 2025, after a high of 19.4 months in 2024 [5]. The wait from authorization to start for the same buildings was 2.6 months in 2025 [27].

Exhibit 7. Average months from permit to start and start to completion, buildings with 20 or more units

Source: U.S. Census Bureau, New Residential Construction, Average Length of Time from Authorization to Start and from Start to Completion, United States, buildings with 20 units or more [27][5]. Totals calculated by FSC by adding the two averages; Census publishes each average separately.

Exhibit 8. Start to completion by region, buildings with 20 or more units (months)

Source: U.S. Census Bureau, New Residential Construction, Average Length of Time from Start to Completion, regional sheets [5]. Changes calculated by FSC.

The practical rule follows from these tables. A project already under construction in the submarket will almost certainly deliver inside the subject's lease-up window and is counted in full. A project with a permit but no start is weighted by the age of the permit and whether its financing is closed. A proposed project with no permit is carried in a separate downside case. Census does not publish a rate at which permits lapse, so the weights are the analyst's judgment and the study prints them. HUD's guide asks for exactly this split: separate estimates of rental units under construction and in planning that are likely to enter the market during the forecast period, including "all rental developments known, not solely those determined by the analyst to be comparable and competitive" [6].

How fast will the units lease up?

As fast as the evidence in the primary market area supports, stated as a share of units per month and tested against the program's lease-up rules. There is no current federal series that a public study can cite for the lease-up pace of new apartments in a given submarket, so the pace comes from field work: the leasing history of comparable properties that opened recently, how many leases each signs per month, what concessions they offer, and which competing buildings will open at the same time.

HUD's guide defines the absorption rate as "a projection of the pace of unit lease up as units become available for occupancy" and asks for the period needed to reach a balanced occupancy rate, giving 5% as an example [6]. Program rules then set outer limits that the study must respect.

Exhibit 9. Lease-up and occupancy rules in program documents

Source: HUD MAP Guide, Sections 3.1.25, 3.1.26, 3.2.8, 3.10.4, 7.5.3 and 7.5.14; HUD Mortgagee Letter 2025-03; 7 CFR 3565 (revised as of January 1, 2026); Fannie Mae Multifamily Guide, Part II, Chapter 2, Section 203.

A rule of thumb such as "20 units a month" says nothing until it is set against the size of the building and the depth of the market. Twenty leases a month is 8.3% of a 240-unit building and 4.0% of a 500-unit building. The study therefore states the pace as a share of units, shows how many net leases per month that implies, and compares it with the paces comparable properties actually achieved.

Lease-up check

The lease-up check converts a unit count and the number of months a projection takes to reach 85% occupancy into the net leases per month and the share of units per month that the projection implies, and sets the result beside reference paces. The inputs are illustrative. They test whether a pro forma's pace is plausible in arithmetic terms; they do not replace the comparable lease-up histories that set the pace in a real study.

The same arithmetic shows what pace costs. Exhibit 10 runs one illustrative 240-unit building at three paces. Every input is an assumption chosen for the example, and every output is a model result, not a market fact.

Exhibit 10. Illustrative lease-up model: one building, three paces

Source: FSC illustrative model (tools/model.py). Assumptions: 240 units delivered together, stabilized occupancy of 95%, average rent of $1,700, constant net leasing pace, one month free per lease. Model outputs, not market data. The 18-month limit is from the HUD MAP Guide [6].

Moving from 20 to 12 leases a month adds about 7.6 months to stabilization and about $1.47 million of forgone rent in this example. That is the gap an interest reserve, an operating deficit escrow or a lease-up reserve has to bridge, and it is why the study sizes those reserves from its own absorption schedule rather than from a percentage of the loan.

What vacancy and stabilized occupancy should the study assume?

The higher of the market's observed vacancy for comparable buildings and the capital source's floor. Nationally, rental vacancy has risen since 2022, and it is highest in principal cities and in the South.

Exhibit 11. Rental vacancy rate by area, third quarter, 2019 and 2026

Source: U.S. Census Bureau, Current Population Survey/Housing Vacancy Survey, Table 1, Quarterly Rental Vacancy Rates, release of October 28, 2026 [29]. Changes calculated by FSC.

Exhibit 12. Rental vacancy rate by units in structure

Source: U.S. Census Bureau, Current Population Survey/Housing Vacancy Survey, Table 5 (annual, release of March 24, 2026) and Table 3 (quarterly, release of October 28, 2026) [4][3]. The survey did not collect data for October 2025, so the 2025 annual figure rests on eleven months.

The Housing Vacancy Survey counts all rental units, including older and lower-quality stock, so it is a market signal rather than the vacancy a new building should carry. The study measures vacancy in the comparable set directly, separates lease-up properties from stabilized ones, and then applies whichever is higher: the observed stabilized vacancy plus concessions and collection loss, or the program floor. Under HUD's 2025 parameters, the floor is 3% for properties with at least 90% rental assistance, 5% for tax credit properties with a rent advantage and 7% for market-rate properties [10]. Fannie Mae's conventional method carries vacancy, concessions and bad debt at no less than 5% of gross potential rent combined [28].

How are achievable rents set?

From a survey of comparable properties, unit type by unit type, at effective rent after concessions. A rent above the comparable set needs a stated reason a renter will pay for, such as a newer building, larger units or a location the competition lacks.

HUD's guide asks the analyst to report the extent of concessions, "particularly in projects in initial occupancy," and to say "whether the quoted rents are overstated due to concessions or other factors" [6]. The analyst must evaluate the subject's rents, and those rents are then compared with the appraiser's independent analysis and reconciled by the lender [6]. Fannie Mae's income method subtracts concessions as their own line: "the aggregate amount of forgone residential rental income from incentives granted to tenants for signing leases" [28].

The rent survey records, for each comparable: unit mix and sizes; asking rent by unit type; current concessions and how long they last; what utilities and parking the rent includes; occupancy and recent leasing pace; year built and amenities; and management. Asking rent minus the value of concessions spread over the lease term gives effective rent. The subject is then placed in the rent ladder for each unit type with adjustments shown line by line.

Exhibit 13. Median gross rent by number of bedrooms, United States, 2025

Source: U.S. Census Bureau, American Community Survey 2025 1-year estimates, Table B25031, Median Gross Rent by Bedrooms, United States [30][16].

Gross rent in the survey includes utilities the tenant pays and covers every renter-occupied unit, old and new. It is useful for one test only: whether the proposed rent is plausible against what households in the area already pay. New construction rents come from new construction comparables.

Exhibit 14. Median asking rent for vacant units, United States and regions

Source: U.S. Census Bureau, Current Population Survey/Housing Vacancy Survey, Table 11A, Median Asking Rent for the U.S. and Regions, release of October 28, 2026 [31]. Annual rows are the published annual medians; 2025 rests on eleven months.

The national median asking rent rose 48.5% from 2019 to 2025, then grew 3.3% from 2025 to the third quarter of 2026. In the South, the third-quarter 2026 median was below the 2023 annual figure. A pro forma that grows rents at a fixed annual rate from today's asking rents assumes the market keeps moving one way; the study states the rent growth assumption separately and shows coverage with no growth at all.

How is income-qualified renter demand counted?

As renter households in the primary market area that can afford the proposed rent and, for restricted units, fall within the program's income limits. HUD defines qualified renter households as households within any limiting income band "who have sufficient minimum income to pay the proposed rent without being rent overburdened" [6]. Two ratios then describe how much of that pool the project needs:

• Capture rate: the subject's units divided by qualified renter households. HUD calls it "the percentage of qualified potential renter households in the PMA that the property must capture to fill the units and achieve stabilized occupancy" [6].
• Penetration rate: all units in the competitive inventory, including the subject, current competitors and proposed competitors, divided by qualified renter households [6].

The primary market area comes first. HUD defines it as the area in which units with similar characteristics, such as bedrooms and rents, "are in equal competition" [6]. It is drawn from where comparable properties draw their residents, commuting patterns and physical barriers, not from a radius.

Exhibit 15. U.S. renter households by household income, 2025

Source: U.S. Census Bureau, American Community Survey 2025 1-year estimates, Table B25118, Tenure by Household Income in the Past 12 Months, renter occupied, United States [32][16]. Shares and the rent column calculated by FSC; the rent column is monthly rent equal to 30% of the band's lowest income.

The national table shows why rent level drives demand. A $1,700 rent at 30% of income needs $68,000 a year; nationally, about 42.9% of renter households earn that much or more, using a straight-line split of the $50,000 to $74,999 band. The study repeats the calculation with primary market area data, and it uses the rent-to-income ratio the program sets: 30% where the program says so, and a stated ratio, often higher, for market-rate units where the lender accepts it.

Exhibit 16. Illustrative demand test: market-rate and tax credit units

Source: FSC illustrative model (tools/model.py) applying national renter income shares from ACS Table B25118 [32] to an assumed market. Income limit, rents, ratios and competing units are assumptions; capture and penetration follow the HUD MAP Guide definitions [6]. Model outputs, not market data.

The example shows the usual pattern. Restricted units draw on a narrow income band, so the same market yields far fewer qualified households and a higher capture rate. For tax credit units, the allocating agency's qualified allocation plan governs the award and the agency approves the analyst [33], so the study tests against the plan in force for the application year.

Rent burden matters for two reasons. It shows how many renters are already stretched, which limits how far rents can rise; and it shows whether a cheaper existing unit is pulling renters the subject is counting on.

Exhibit 17. Gross rent as a share of household income, U.S. renter households, 2025

Source: U.S. Census Bureau, American Community Survey 2025 1-year estimates, Table B25070, Gross Rent as a Percentage of Household Income, United States [15][16]. Shares calculated by FSC over the 43,437,030 renter households with the ratio computed.

What unit mix and unit sizes does the market support?

The mix the qualified renter pool needs, checked against what the comparable buildings lease fastest. New rental buildings have moved toward smaller units: of multifamily units completed for rent in 2025, 51% were studios or one-bedroom units, and the median built-for-rent unit had 1,000 square feet [34][35].

Exhibit 18. Multifamily units completed for rent, by bedrooms and size

Source: U.S. Census Bureau, Characteristics of New Housing, Number of Multifamily Units Completed by Number of Bedrooms per Unit: Built for Rent, and Median and Average Square Feet of Floor Area in Multifamily Units Completed [34][35]. Percent distributions as published.

The national mix is a reference, not a target. Household size drives the bedroom count each renter needs, and the share of one- and two-person renter households in the primary market area sets how deep the studio and one-bedroom demand runs. The study tests each unit type separately: qualified households for that unit type and rent, comparable occupancy by unit type, and the leasing pace for that type in recent lease-ups. A building that leases its one-bedroom units in eight months and its three-bedroom units in twenty is not stabilized at month eight.

HUD's guide expects the same discipline. It asks the market study to describe the proposed units by type and size, "Actual (paint to paint) size" as well as brochure size, and the proposed rents, utility allowance and gross rents by unit type [6]. It also asks that demand estimates "address the changes in renter households by household size, not just in total" [6].

Exhibit 19. Multifamily units completed for rent, by floors in building

Source: U.S. Census Bureau, Characteristics of New Housing, Number of Multifamily Units Completed by Number of Floors in Building: Built for Rent [36]. Percent distributions as published.

Building height matters for more than cost. Under the Fair Housing Act rules, covered multifamily dwellings include every unit in a building of four or more units with one or more elevators, and the ground floor units in other buildings of four or more units [37]. A three-story walk-up and a five-story elevator building carry different accessibility scopes and costs, and the budget the study tests has to reflect the one being built.

How do conventional, affordable, build-to-rent, student and senior apartments differ?

They draw on different renter pools, so they need different demand models, even when the buildings look alike. A study that runs one template across all of them will count the wrong households.

Exhibit 20. Apartment product types and what changes in the study

Source: 26 U.S.C. 42; 7 CFR Part 3565; FHFA 2026 Multifamily Cap and Definitions; HUD MAP Guide; HUD Mortgagee Letter 2025-03; Fannie Mae Multifamily Guide; 13 CFR Part 120, as cited in each row. Comparison by FSC.

Nearly all units started in buildings with two or more units are intended for rent. In 2025, 392,000 of the 416,000 units started in buildings with two or more units were intended for rent [40].

Exhibit 21. Units started in buildings with two or more units, by intent

Source: U.S. Census Bureau, New Residential Construction, Housing Units Started by Intent and Design, United States annual [40]. Share calculated by FSC; detail may not add because of rounding.

For build-to-rent, the national starts series is less useful than the local one: the study counts rented single-family homes and new rental subdivisions in the market area, and it treats the 30.8% of U.S. renters who live in single-family houses [12] as a separate pool that overlaps apartment demand only in part. For student housing, demand starts from enrollment and the share of students the university houses, and the lease-up runs on the academic calendar, so a building that misses its fall opening can wait a year for its next leasing season. For senior apartments without care, the study counts households by age band; where services or care are part of the rent, the property is an operating business and belongs in a senior housing feasibility study.

Which capital sources read a multifamily study, and what does each test?

Apartments route through more capital sources than any other property type, and each reads the study for a different question. The study is built to the union of requirements across the sources in play, at the threshold of the strictest one.

Exhibit 22. Capital sources for apartments and what each reviewer tests

Source: as cited in each row. Comparison by FSC.

What did HUD change in 2025?

HUD lowered its coverage floors and raised its leverage limits for its main apartment programs. Mortgagee Letter 2025-03, dated January 8, 2025, applies to Sections 221(d)(4) and 223(f) and took effect immediately for any application that had not reached initial endorsement [10].

Exhibit 23. HUD 221(d)(4) and 223(f) coverage and leverage after Mortgagee Letter 2025-03

Source: U.S. Department of Housing and Urban Development, Mortgagee Letter 2025-03, Multifamily Changes in Debt Service Coverage Ratios and Loan to Value/Loan to Cost Ratios, January 8, 2025 [10]. Cash-out refinance ratios were not changed.

Two practical consequences follow. A 1.15 coverage floor with a 7% vacancy factor on a market-rate deal leaves little room for a rent shortfall, so the rent conclusion carries more weight than it did under the 1.176 floor. And the maximum loan is the lesser of several tests, including statutory limits, coverage and loan ratios [10], so the study's net operating income often sets the loan amount. Section 221(d)(4) rests on 12 U.S.C. 1715l, which is designed to help private industry provide housing for low and moderate income families and requires a (d)(4) project to include five or more family units [45], and HUD-insured construction must pay prevailing wages under 12 U.S.C. 1715c [46], which the construction budget has to carry.

What do the 2026 Enterprise caps mean for a deal?

They limit how much conventional apartment debt Fannie Mae and Freddie Mac can buy, and they favor affordable loans. FHFA set each Enterprise's 2026 cap at $88 billion, $176 billion combined, and required that at least 50% of their multifamily business be mission-driven affordable housing [41].

Exhibit 24. FHFA 2026 multifamily caps and mission-driven definitions

Source: Federal Housing Finance Agency, news release of November 24, 2025, and 2026 Multifamily Cap and Definitions [41][38].

For the study, the definitions matter more than the cap. If a lender plans to count a loan as mission-driven, the study shows the share of units whose rents are affordable at the relevant income threshold, unit type by unit type, so the classification can be checked.

What does an affordable or tax credit market study add?

A demand count limited to income-eligible renters who can pay the restricted rent, tested against the allocating agency's plan. The tax credit statute itself requires it: the credit amount is zero unless the allocation follows a qualified allocation plan and "a comprehensive market study of the housing needs of low-income individuals in the area to be served by the project is conducted before the credit allocation is made and at the developer's expense by a disinterested party who is approved by such agency" [33].

Exhibit 25. Tax credit rules that shape the market study

Source: 26 U.S.C. 42(g), (h) and (i), as published by GovInfo (2024 edition) [33]. Right-hand column by FSC.

The rent advantage matters twice. HUD's 2025 parameters give tax credit deals with a rent advantage to market the lower 1.11 coverage floor and the higher 90% leverage [10], so the study's comparison of restricted and market rents can change the loan size. And a restricted rent that is barely below market gives renters little reason to accept income certification, so the study shows the gap by unit type.

Where tax credits are layered on a USDA Section 515 property, the rule is explicit: if more units carry tax credit restrictions than will receive USDA rental assistance, "the market feasibility documentation must clearly reflect a need and demand by LIHTC income-eligible households financially able to afford the projected rents without such a subsidy" [8].

How do USDA Section 538 and 515 studies work?

Section 538 guarantees private loans for rural rental housing for low- and moderate-income households; Section 515 is USDA's direct rural rental loan program. Both read the market evidence closely, and both put income and rent limits on the units.

Exhibit 26. USDA Section 538 terms a study must respect

Source: 7 CFR 3565.202, 3565.203, 3565.204, 3565.208 and 3565.303 (revised as of January 1, 2026) [9]; 90 FR 27819 and 91 FR 60930, Federal Register document records [42].

The September 2026 notice also starts a preservation pilot from October 9, 2026 to September 25, 2028 that changes the coverage rule for the first 200 Section 538 guarantees [42]. Which terms apply depends on the loan, so the study states the terms it tested.

For Section 515, USDA reviews every initial loan application for eligibility and feasibility, and that review includes "A market feasibility review" and an agency site visit [8]. USDA's September 2026 notice describes the Section 515 portfolio as aging and aims its pilot at preservation transfers [42], so many Section 515 studies now support transfers and rehabilitation. The local USDA portfolio is often the best evidence of unmet need: its occupancy and waiting lists show whether income-qualified households are already waiting for units.

A USDA Section 538 property in the market area also matters for a market-rate study, because it competes for moderate-income renters at rents capped by rule. The study lists those properties and their rent limits in the competitive set.

Can SBA or USDA business programs finance apartments?

No, not as apartments. SBA's operating procedure states that "Apartment buildings and mobile home parks are not eligible" [43]. SBA can finance a building that contains apartments only where an eligible operating business occupies it: at least 51% of an existing building, or at least 60% of new construction, with the rest leasable to tenants [39]. In that case the apartments are leased space and the study must show that the business, not the rent roll, repays the loan. SBA may require a feasibility study as a loan condition [39].

USDA's Business and Industry guarantee lists apartments among ineligible projects where the primary purpose is independent housing [44]. Rural apartments go to the Section 538 and 515 programs instead. Licensed care facilities follow different rules and are covered on the assisted living feasibility study page.

How are income and operating expenses tested?

Line by line, on the basis the capital source will use, starting from the rent roll and the tax bill rather than the seller's summary. Fannie Mae's conventional income method is a clear public example of how an agency lender rebuilds the numbers, and the study mirrors it so the lender's figures and the study's figures reconcile.

Exhibit 27. How the agency income method treats each line

Source: Fannie Mae Multifamily Guide, Part II, Chapter 2, Section 203, Income Analysis, required net cash flow table for conventional loans [28]. Right-hand column by FSC.

Taxes and insurance deserve their own paragraph because they move first after a purchase. The seller's trailing twelve months reflect the seller's assessment and the seller's insurance program. A sale can trigger reassessment, and Fannie Mae's method tells the lender to include "any expected increase" where a sale would trigger one [28]. The study therefore rebuilds taxes from the local assessment practice and the purchase price, and takes insurance from a current quote rather than last year's premium. On new construction, there is no history at all, so every expense line comes from comparable properties of similar age, size and service level, and the tax line is estimated on the completed value.

HUD reads expenses the same way. For properties that applied within three years of their certificate of occupancy, HUD measures coverage on "actual revenue collected less normalized operating expenses" to decide whether the program ratio has been achieved [6]; for the study, the operative point is that collected revenue, not scheduled rent, is what counts.

How are NOI, coverage and sensitivity tested?

By building net operating income month by month through lease-up and then at stabilization, dividing by debt service at the loan's real terms, and stressing the inputs that move most. Each program sets its own floor.

Exhibit 28. Minimum debt service coverage named in program rules

Source: as cited in each row.

The study then shows how far each input can move before coverage breaks. Exhibit 29 runs one illustrative stabilized building. The inputs are assumptions chosen to show the method; the results are model outputs.

Exhibit 29. Illustrative coverage sensitivity, stabilized year

Source: FSC illustrative model (tools/model.py). Assumptions: 240 units; $1,700 average rent; $75 per unit per month of other income; 5% vacancy, concessions and credit loss; $7,200 per unit per year of operating expenses including taxes and insurance; $300 per unit per year of replacement reserve; a $32,000,000 loan at 6.50% with 30-year amortization. Model outputs, not market data.

In this example a 5% rent miss takes coverage from 1.26 to 1.16, just above HUD's market-rate floor of 1.15, and the combined downside case reaches breakeven. Breakeven occupancy for the base case is 82.7% of potential income. That is the kind of statement a credit committee can act on: it tells the lender which assumption the loan depends on and by how much.

The interest rate case is not arbitrary. On November 9, 2026, the 10-year Treasury constant maturity yield was 4.88%, the 5-year 4.67% and the 7-year 4.76%, and the bank prime rate was 7.00% [47]. Fixed-rate permanent loans are often priced off Treasury yields and floating construction loans off short-term rates, so the study tests coverage at the rate the takeout is likely to carry, not the rate on the day of the report.

What site, design and construction rules change the budget?

Several federal rules apply to apartments in particular, and each has a cost the budget must carry.

• Accessibility. Covered multifamily dwellings for first occupancy after March 13, 1991 must be designed and built with an accessible entrance on an accessible route and the other features the rule lists [48]. Covered dwellings are every unit in an elevator building of four or more units and the ground floor units in other buildings of four or more units [37].
• Prevailing wages. HUD-insured construction under Section 221(d)(4) requires the principal contractor to certify that laborers and mechanics were paid at least the wages prevailing in the locality, as determined by the Secretary of Labor [46].
• USDA program compliance. Section 538 properties must comply with Section 504 of the Rehabilitation Act, the Fair Housing Act and the Americans with Disabilities Act, among other statutes [9].
• Appraisal. Federally regulated lenders need an appraisal by a state certified appraiser on commercial real estate transactions over $500,000 [7]. The feasibility study does not replace it.

The study does not design the building, but it checks that the budget includes these costs and that the schedule allows for them. A budget that omits prevailing wages on a HUD-insured deal, or prices an elevator building as a walk-up, will not survive the lender's cost review.

What state rules change the operating model?

Security deposit caps, deposit return deadlines, late fee limits, notice periods and rent regulation all differ by state, and some change the income line or the cost of turnover. The study states the rules that apply in the subject's state and city.

Exhibit 30. Selected state rules that affect apartment operations

Source: state statutes and official state summaries as cited in each row, read November 11, 2026. This is a selection, not a complete survey; local ordinances can add rules.

Two of these rules feed the numbers directly. A late fee cap limits other income, and a rent increase cap limits how fast in-place rents can follow the market, so a study in a capped state tests rent growth against the cap as well as the comparables. Deposit rules matter less to income than to operations and reserves, but a lender will expect them to be right in the management plan.

What happens after the loan closes?

The study becomes the baseline the lender measures the property against. During lease-up, the lender compares actual leases, effective rents and concessions with the absorption schedule each month; if leasing falls behind, the reserve the study sized is drawn and the question becomes whether the gap is pace or rent. HUD's rule for recently completed properties shows the test in its plainest form: program coverage held for three straight months on actual collections [6].

A useful study makes this monitoring easy. It states the absorption schedule by month, the effective rents by unit type, the concessions assumed and the competing deliveries expected, so each one can be checked against what happens. When a lender asks for a study update, HUD's description of one is a good model: an update of the competitive environment, a recalculation of net and effective demand, and a review of the proposed rents in the current market, often as a desktop analysis [6].

What must a multifamily feasibility study contain?

At a minimum, the following. Items 1 to 9 make up the market study; items 10 to 15 complete the feasibility study.

1. A description of the site and its surroundings, access, visibility and nearby services.
2. The project: units by type and size, amenities, parking, utility arrangement, rents and any income or rent restrictions.
3. The primary market area, drawn from competitive overlap and renter origin, with its boundaries explained.
4. Economic context: employment by sector, major employers and recent changes.
5. Demographics: population and household trends, renter households by income, size and age.
6. The competitive inventory: every comparable property with units, mix, rents, concessions, occupancy and leasing pace, field-verified.
7. The pipeline: projects under construction, permitted and proposed, with the weight given to each.
8. Demand: qualified renter households, capture rate and penetration rate, by unit type and, for restricted units, by income band.
9. Absorption: a monthly lease-up schedule and the period to stabilized occupancy.
10. Rents and income: effective rents by unit type, other income, vacancy and loss at the higher of market or program floor.
11. Operating expenses, line by line, with taxes and insurance rebuilt for the new owner or the completed building.
12. A development or acquisition budget with sources and uses, interest during construction, reserves and contingency.
13. Coverage by month through lease-up and at stabilization, with sensitivity cases.
14. Program compliance: the tests of the capital source in play, item by item.
15. A conclusion: feasible, feasible with stated conditions, or not feasible as proposed, with every source and assumption listed.

How much does a multifamily feasibility study cost, and how long does it take?

A market-rate study runs $7,500 to $14,000 and takes 4 to 8 weeks. An affordable study, including tax credit and workforce housing, runs $12,000 to $22,000 and takes 6 to 10 weeks.

Source: FSC published fee schedule for multifamily studies.

Fees are fixed in the engagement letter before work begins and do not change with the conclusion. Turnaround runs from the date the document set is complete. The range within each band depends on the number of unit types and income bands, the size of the primary market area, the number of comparables to survey and whether the study must satisfy more than one capital source.

To start, the practice needs: the site location; unit count, mix and sizes; site plan and amenity program; the development budget, or for an acquisition the purchase contract, trailing twelve months and current rent roll; the capital source and program; any income and rent restrictions by area median income band; and any prior market study, appraisal or capital needs assessment in the file.

How the study runs

1. Scoping: confirm the capital source, program and the tests that apply, and fix the fee.
2. Document intake: budget, plans, rent roll and operating statements as applicable.
3. Field work: site inspection and a survey of comparable properties, rents, concessions and occupancy, with the pipeline checked project by project.
4. Analysis: demand, capture and penetration, absorption, rents and expenses, with the model built month by month.
5. Review: the draft is checked against the lender's or agency's requirements before release.
6. Final report: signed by Sarrah Allen, MAI, with written answers to the lender's follow-up questions. More about the practice is on the about page, and the standards that separate a study a lender can rely on from one it cannot are set out in what makes a feasibility study bankable.

Download the evidence behind this page's exhibits (CSV, 472 data points with sources)

Who signs your study

FSC Consulting, Inc. is led by Sarrah Allen, MAI, a Member of the Appraisal Institute, who signs every study the practice issues. The certification page names the lead analyst who performed the research and modeling, the senior reviewer who checked it, the data sources used and the independence representations made, and both sign. The person who signs answers the credit officer's or allocating agency's questions after delivery, as part of the fee.

Independence on a multifamily file

• No ownership, development or management interest in any property the practice evaluates.
• No identity of interest with the borrower, sponsor, developer, syndicator or any affiliate, which is the test HUD, USDA and state allocating agencies apply.
• No referral fees from operators, developers or vendors.
• Conflicts are disclosed in the engagement letter before work begins, including any prior work on a comparable property. The sponsor or lender may terminate at that point with a full retainer refund.
• No advocacy work: the conclusion follows the evidence, whatever it is.

Quality and coverage

• Four-pass review: lead analyst, senior analyst, and a second senior reviewer who took no part in the primary analysis.
• Errors and omissions insurance of $1 million; a certificate is available before the engagement letter is signed.
• Licensed data: CoStar, IBISWorld, RMA Annual Statement Studies, Esri Business Analyst and Moody's Analytics, with NCHMA methods for capture, penetration and rent comparability.

More about the practice and the person who signs →