The 1–4 unit residential investment property and the 5+ unit apartment building seem similar on the surface — both are rental properties, both generate income, both require management. But from a financing perspective, they're in completely different worlds.

1–4 unit properties are financed with residential mortgage products: conventional loans, FHA, DSCR, and other single-family-adjacent products. Once you cross 5 units, you're in commercial real estate financing territory — different loan products, different underwriting logic, different lender types, and different terms.

This guide covers everything you need to know about financing 5+ unit apartment buildings.

Why 5+ Units Is the Dividing Line

The 5-unit threshold isn't arbitrary. It's where Fannie Mae and Freddie Mac stop buying loans. Residential conforming financing (the dominant product for 1–4 units) is not available for 5+ unit properties because these properties aren't eligible for government-sponsored enterprise (GSE) backing.

Above 5 units, you're working with:

• Commercial banks offering portfolio loans
• Agency lenders (Fannie Mae, Freddie Mac multifamily programs)
• HUD/FHA multifamily programs
• CMBS (commercial mortgage-backed securities) lenders
• Private/bridge lenders for value-add and transitional assets

The underwriting logic also changes. For 1–4 units, lenders primarily care about your personal income and ability to repay. For 5+ units, lenders primarily care about the property's income — whether the rents cover the debt service with adequate cushion.

How Multifamily Lenders Underwrite

Commercial multifamily underwriting centers on the property's Net Operating Income (NOI) and the resulting Debt Service Coverage Ratio (DSCR).

Step 1: Calculate Gross Potential Rent (GPR)
Total annual rent if every unit were occupied at current lease rates.

Step 2: Apply vacancy and credit loss
Standard assumption: 5–10% vacancy allowance, even if the property is currently fully occupied. Lenders use stabilized vacancy assumptions, not current snapshot.

Step 3: Add other income
Parking, laundry, storage, pet fees, and other ancillary income.

Step 4: Subtract operating expenses
Property taxes, insurance, property management (typically 8–10% of gross rents even if self-managed), repairs and maintenance, utilities, and reserves for replacement (typically $200–$400/unit/year).

Step 5: Net Operating Income (NOI)
GPR - Vacancy - Operating Expenses = NOI

Step 6: Calculate DSCR
NOI ÷ Annual Debt Service = DSCR. Most multifamily lenders require 1.20–1.25 DSCR minimum.

Example: 12-unit apartment building

• Monthly rents: 12 units × $1,200 = $14,400/month = $172,800 GPR
• 5% vacancy: -$8,640
• Other income (laundry): +$1,800
• Effective Gross Income: $166,000
• Operating expenses: $72,000 (taxes, insurance, management, maintenance, reserves)
• NOI: $94,000
• Loan amount: $900,000 at 7%, 25-year amortization = $76,200 annual debt service
• DSCR: $94,000 ÷ $76,200 = 1.23 — meets minimum but tight

Multifamily Loan Products

Conventional Commercial Bank Loans (Portfolio Loans)

Community banks, regional banks, and some national banks lend on multifamily properties using their own balance sheet. These "portfolio loans" offer flexibility that agency products don't.

Typical terms:

• LTV: Up to 75–80% for stabilized properties
• DSCR: 1.20–1.25 minimum
• Term: 5–10 year balloon with 20–25 year amortization
• Rate: Typically floating (prime-based) or short-term fixed
• Down payment: 20–25%

Best for: Smaller properties (5–20 units), investors with banking relationships, properties that don't meet agency standards.

Fannie Mae Multifamily (DUS Loans)

Fannie Mae's Delegated Underwriting and Servicing (DUS) program provides financing for 5+ unit properties through approved lenders. Fannie Mae sets the guidelines; approved lenders (primarily large banks and specialized multifamily lenders) originate and service the loans.

Typical terms:

• Minimum loan: $750,000 (some programs higher)
• LTV: Up to 80% for market-rate properties
• DSCR: 1.25 minimum
• Term: 5, 7, 10, 12, or 30 years (fixed rate options available)
• Amortization: 30 years
• Rate: Fixed or floating

Best for: Stabilized market-rate properties of 5+ units, investors seeking long-term fixed-rate financing, loan amounts above $750,000.

Freddie Mac Multifamily

Similar to Fannie Mae DUS, Freddie Mac's multifamily programs serve stabilized 5+ unit properties. The two agencies compete for business, which benefits borrowers.

Small Balance Loan (SBL) Program: Freddie Mac's program specifically for loans between $1 million and $7.5 million on 5+ unit properties in smaller markets — one of the most important products for individual investors targeting secondary markets.

HUD/FHA Multifamily Programs

HUD's 223(f) program provides mortgage insurance for the purchase or refinancing of existing multifamily properties. Known for the highest LTV (up to 83.3%) and longest amortization (35 years) in the multifamily market, with fully fixed rates.

The tradeoff: HUD loans are the best-priced multifamily product available — but they're also the slowest (9–12 months from application to closing is typical) and most complex. They work best for long-term hold investors who can wait for the process.

Bridge Loans for Value-Add Multifamily

For properties that aren't yet stabilized — high vacancy, below-market rents, deferred maintenance — conventional and agency lenders typically won't lend because the current NOI doesn't support their DSCR requirements.

Bridge lenders fill this gap: they lend based on the property's as-stabilized value and potential NOI after renovations, at higher rates and with an expectation of refinancing into permanent financing once stabilization is achieved.

Typical bridge terms: 12–24 months, interest-only, 65–75% of as-is value or 70–75% of as-stabilized value. Higher rates (8–12%) justified by the transitional nature of the asset.

What Multifamily Lenders Look for Beyond the Numbers

The NOI and DSCR are primary — but lenders also evaluate:

• Borrower experience — Managing a 20-unit apartment building is different from managing a single-family rental. Lenders for larger properties want to see relevant experience.
• Sponsorship strength — Net worth and liquidity of the principal borrower(s). Many agency and HUD programs have minimum net worth requirements (typically equal to the loan amount).
• Market conditions — Lenders evaluate the property's market: rent trends, vacancy rates, new supply pipeline. A 95% occupied property in a market with 5,000 units under construction is a different risk than the same property in a supply-constrained market.
• Property condition — Deferred maintenance is a risk factor. Properties with significant deferred maintenance may require repairs as a condition of closing, or may be ineligible for agency financing.
• Rent roll quality — Lease term diversity (not all leases expiring at once), tenant payment history, and below-market rents (which represent upside but also near-term uncertainty).

The Path from Small Multifamily to Large Multifamily

Most apartment investors start with 2–4 unit properties financed with residential products, then transition to 5–20 unit buildings with commercial bank portfolio loans, then scale to agency and HUD financing as portfolio size and experience grow.

Each step changes the financing ecosystem significantly. Building relationships with multifamily lenders before you're ready for each product level — understanding what they need, what the qualification bar looks like — is how the most successful apartment investors position themselves to move quickly when the right deal appears.

Self-employed investors and those with tax-optimized income will often find that DSCR loans for real estate investors are a better path than agency financing for certain multifamily properties. For financing options across multifamily and commercial property types, BestLoanUSA works with lenders specializing in each asset class. When you're ready to explore options, submit a commercial real estate loan application and we'll connect you with the right lender tier for your portfolio size and property type.

💡 BestLoanUSA works with multifamily lenders from community bank portfolio products through agency financing. Pre-screen your multifamily financing options with no credit impact.