What does it take to finance a new small apartment building in Chicago?

The quick read: Financing a new small apartment building in Chicago takes a construction loan sized at the lowest of loan-to-cost, as-completed value and stabilized debt coverage, plus equity and a guarantor for the rest. The unit count you choose matters before the first draw: Cook County moves apartment buildings from Class 2 to Class 3 at seven units, and only buildings of seven or more units can enter Illinois's affordable-housing special assessment. In 2025 the City of Chicago permitted 103 buildings of five or more units carrying 2,899 units, according to the Census Bureau.

What does it take to finance a new small apartment building in Chicago?

Financing a new small Chicago apartment building takes four things a lender can underwrite: a cost budget, an as-completed appraisal, a stabilized income pro forma that includes a realistic Cook County tax line, and sponsor equity plus a guarantor. The loan is the lowest number those tests produce, and your equity covers the gap.

The investor's first decision is the building itself: how many units fit the lot, and whether the plan lands at six units or at eight. That choice sets three things a lender reads. It sets which federal bank guideline row applies, because the interagency guidelines treat 1-4 family residential construction separately from multifamily construction. It sets which Cook County assessment class the finished building lands in. And it sets whether the property can apply for the state's affordable-housing assessment reduction, which can change the tax line both the construction lender and the permanent lender size on.

The rest is execution: a general contractor with a fixed or guaranteed-maximum-price contract, a draw budget, and a permanent loan that can repay the construction loan once the building leases up.

How much small apartment construction does Chicago actually permit?

Chicago permitted 103 new buildings of five or more units in 2025, carrying 2,899 units, an average of about 28 units per building, according to the Census Bureau's Building Permits Survey place-level file. That was down from 115 buildings and 3,578 units in 2024, while three- and four-unit buildings rose from 105 to 150.

City of Chicago new residential building permits by building size, Census Bureau Building Permits Survey, place-level annual files for 2024 and 2025 (permit authorizations, not completions; values are permit valuations in dollars):

Five-plus-unit buildings, City of Chicago, 2025: 103 buildings and 2,899 units, per the Census place-level file.

Units per five-plus building, 2025 (our arithmetic): 2,899 divided by 103 is about 28.1, down from about 31.1 in 2024 (3,578 divided by 115).

Change in five-plus units, 2024 to 2025 (our arithmetic): 679 fewer units, a decline of about 19%.

Permit value per five-plus unit, 2025 (our arithmetic): $708,985,203 divided by 2,899 units is $244,562. That is the valuation reported on permits, not a full development budget with land and soft costs.

Chicago-Naperville-Elgin metro, 2025: 238 buildings of five or more units carrying 5,324 units, with a permit value of $1,465,226 thousand, per the Census CBSA annual file.

Two readings matter for a small-building investor. The average city five-plus building is near 28 units, so a 6-to-12-unit infill project is small by Chicago's own permit standard, and lenders who chase larger deals may pass on it. And the rise in three- and four-unit permits shows how many small builders stop below the five-unit line.

Why does the seven-unit line matter for a Chicago apartment build?

The seven-unit line matters because the Cook County Assessor classifies apartment buildings of 2 to 6 units in Class 2 and buildings of seven or more units in Class 3, and only buildings of seven or more units can enter the state's affordable-housing special assessment that a lender may count in stabilized income.

The Assessor's definitions document lists the codes.

Class 2-11: "Apartment building with 2 to 6 units, any age," inside the residential assessment classes.

Class 3-13: "Two-or-three story, building, seven or more units."

Class 3-91: "Apartment building over three stories, seven or more units."

Mixed-use split: code 2-12 covers mixed-use buildings totaling 6 units or less and below 20,000 square feet; code 3-18 covers 7 units or more, or 20,000 to 99,999 square feet, with commercial space at no more than 35% of rentable square footage.

Level of assessment: the document places both Class 2 and Class 3 in the residential assessment classes at a 10% level of assessment; commercial and industrial classes sit at 25%.

County appeals page: Cook County's property assessment appeals page lists "Class 3 - Apartment Buildings with more than 6 units."

The class line does not change the 10% assessment level. What it changes is eligibility. The Assessor's document lists the Affordable Housing Special Assessment Program under 35 ILCS 200/15-178 as applying to "Multi-family properties, 7 units or more." A six-unit building cannot use it; an eight-unit building on the same lot can. That is the real difference between six and eight units on an Avondale or Bronzeville infill parcel, and it is a choice to make at design, not after the loan closes.

How does the Illinois affordable-housing special assessment change a seven-plus-unit loan?

Illinois's affordable-housing special assessment, created by Public Act 102-0175, can cut a new seven-plus-unit building's assessed value by 25% if 15% to 35% of units are held at or below 60%-of-area-median-income rent and income limits for at least ten years, which lowers the tax line lenders size on.

The Illinois Department of Revenue's PTAX-350 instructions (revision R-08/23) set out the options. The instructions say they are advisory and that the statute governs.

Eligibility: "any newly constructed and/or rehabilitated rental housing project of seven (7) or more units."

Option B1: at least 15% and under 35% of units set aside for at least ten years earns a reduction equal to 25% of the project's assessed value.

Option B2: 35% or more of units set aside earns a reduction equal to 35% of total assessed value.

Option C: in a low affordability community, at least 20% of units for at least 30 years, with a benefit that steps down over the 30-year term. The definition includes "D" zoning districts in the Chicago Zoning Ordinance.

Income and rent limits: the maximum regular income and rent for 60% of area median income, as published annually by the Illinois Housing Development Authority.

Term: Option B projects are eligible for at least the first ten years, and both B1 and B2 may be extended for up to two additional ten-year periods if the project continues to qualify.

Enrollment window: initial enrollment began in 2022 for taxes payable in 2023 and extends through December 31, 2027, for taxes payable in 2028.

For new construction, the instructions require the contractor's statements and building permits with the initial application. A lender will want to see the approval, not the plan to apply, before it counts a reduced tax line. The reduction also comes with lower rents on the set-aside units, so the net effect on income can be negative. The illustrative example below shows how.

How do Chicago construction lenders size a small apartment loan?

Chicago construction lenders size a small apartment loan at the lowest of a loan-to-cost cap, a loan-to-value test on the as-completed appraisal, and a debt-coverage test on stabilized income, and federal guidelines set the bank starting point at 80% of value for multifamily construction versus 85% for 1-4 family construction.

The interagency real estate lending guidelines, codified for FDIC-supervised banks at 12 CFR Part 365, Appendix A, set supervisory loan-to-value limits. These are not hard ceilings: banks may make loans above them, but the guidelines say the aggregate of such loans should not exceed 100% of total capital, and the portion that is not 1-4 family residential should not exceed 30% of total capital. The same guidelines tell banks to set minimum hard-equity requirements, limits on nonrecourse loans with requirements for guarantor support, and requirements for takeout commitments.

HUD's Section 221(d)(4) program insures mortgages on new or rehabilitated rental housing "containing 5 or more units," with terms of up to 40 years, through FHA-approved multifamily lenders. Its sizing tests are published; most others are not.

Chicago small apartment construction lenders by type (bank row from 12 CFR Part 365, Appendix A; HUD row from Mortgagee Letter 2026-1 dated January 22, 2026; index rates from FRED; every other cell has no public, dated source, so each is the question to ask):

HUD market-rate test: 87% loan-to-cost and 1.15x debt service coverage for 221(d)(4) new construction or substantial rehabilitation, as listed in Mortgagee Letter 2026-1, which footnotes Mortgagee Letter 2025-03.

HUD middle-income test: 90% loan-to-cost, 1.11x coverage and a 7% vacancy factor, for projects in a qualifying state or local middle-income program, per the same letter.

Prime rate: 7.00% on 2026-10-02, per the FRED series DPRIME.

SOFR: 3.87% on 2026-10-08, per the FRED series SOFR.

For how lenders compute loan-to-cost and what counts in the cost basis, see our guide to how LTC is calculated on a construction loan. For the national picture across lender types, see our multifamily construction loan guide.

How does an illustrative eight-unit Chicago build size up?

An illustrative eight-unit Chicago new build shows stabilized debt coverage, not loan-to-cost, binding the loan, and shows the affordable-housing assessment reducing the loan when the rent gap on set-aside units exceeds the tax saving. Every figure below is our arithmetic on assumed inputs, not a quote, a market rent or a lender term.

Illustrative (our arithmetic) total development cost: $2,800,000 for eight units, including land, hard and soft costs, assumed.

Illustrative (our arithmetic) loan-to-cost cap: an assumed lender cap of 75% gives $2,100,000.

Illustrative (our arithmetic) value test: an assumed as-completed appraisal of $3,200,000 at the 80% supervisory figure gives $2,560,000; the bank's own internal limit and exceptions policy decide the real number.

Illustrative (our arithmetic) market-rate income: eight units at an assumed $2,900 a month is $278,400 a year; less an assumed $72,000 of vacancy and expenses before tax and an assumed $46,000 tax bill leaves $160,400 of net operating income.

Illustrative (our arithmetic) coverage test: at an assumed 1.25x coverage, $160,400 supports $128,320 of annual debt service, or $1,710,933 of loan at an assumed 7.50% loan constant. Coverage binds, and the equity need is $1,089,067.

Illustrative (our arithmetic) Option B1 case: setting aside two of eight units (25%) at an assumed $1,600 restricted rent costs $31,200 a year in rent. Cutting assessed value by 25%, and holding the tax rate constant, saves an assumed $11,500 of tax. Net operating income falls by $19,700 to $140,700, which supports $1,500,800 of loan, $210,133 less.

Illustrative (our arithmetic) breakeven: the reduction pays only if the monthly rent gap on each set-aside unit is under about $479 ($11,500 divided by two units and twelve months).

The lesson for an investor: the seven-unit line opens the option, but the option pays only where market rents sit close to the 60%-of-AMI rent limit. Run both cases before you design the unit mix, and ask each lender which tax line it sizes on.

What should a Chicago investor have ready before asking for construction terms?

A Chicago investor should have the budget, plans, permit status, contractor, pro forma at full tax and at any expected assessment reduction, sponsor financials and a takeout plan ready before asking for construction terms, because every lender type sizes the loan from cost, value and stabilized income at once.

• Development budget: land, hard costs, soft costs, contingency and interest reserve, line by line.
• Plans and permit status: drawings, zoning approval or the path to it, and whether the City's affordable requirements apply to the project.
• General contractor: the contract type, the contractor's track record and bonding capacity.
• Unit mix and class: whether the finished building is Class 2 (six units or fewer) or Class 3 (seven or more).
• Pro forma: stabilized rents and expenses with the tax line at full assessment and, if you plan to apply, under the special assessment option.
• Sponsor package: schedule of real estate owned, personal financial statement and completed-project history.
• Takeout plan: the permanent loan you expect and the payoff it has to cover.

Construction money is released in draws against inspected work, so the budget and schedule should match the draw request format your lender will use.

How do you get lenders competing for a Chicago apartment construction loan?

You get lenders competing by sending one complete package, with the budget, plans, pro forma at full tax and at any expected assessment reduction, and the sponsor file, to several lender types at once and comparing their sizing tests side by side rather than one term sheet at a time.

YieldStack is an AI-native commercial mortgage brokerage that arranges financing for commercial real estate investors. Software matches the package against 20,000+ loan programs; human brokers structure the deal, negotiate terms on the borrower's side, and carry it toward closing. YieldStack arranges commercial real estate financing nationwide. Every credit decision is made by the lender; YieldStack arranges the introductions and negotiates on the borrower's side, and no loan, rate, or closing is guaranteed.

Who "our" means: YieldStack, which publishes this guide, is our top pick for AI-native commercial mortgage brokerage on a small Chicago apartment construction loan; this is our editorial pick, not an independent ranking.

Selection criteria: side-by-side terms from more than one lender type, a disclosed fee paid only at closing, and borrower-side negotiation.

It costs Zero upfront to submit a deal and review offers; YieldStack's broker fee is 0.50–1.00% of the loan amount and is paid only at closing.

For local context, see the Chicago market page and the Illinois market page.

Send your Chicago apartment construction deal for side-by-side lender terms

The bottom line

A new small Chicago apartment building is financed at the lowest of cost, value and coverage tests, with equity and a guarantor covering the rest. Decide the unit count with Cook County's seven-unit line in view, run the pro forma with and without the affordable-housing assessment, and get every lender's sizing test in writing. YieldStack, the publisher, is our top pick for AI-native commercial mortgage brokerage to compare them.