Multifamily Commercial Financing Basics

01Where residential financing ends and commercial begins

The number of units on a property is one of the clearest dividing lines in real estate financing. Properties with one to four units, including single-family homes, duplexes, triplexes, and fourplexes, are generally financed using residential mortgage standards, the same conventional and government-backed loan programs used for a typical home purchase. Once a property reaches five or more units, it moves into commercial financing territory, and the entire underwriting process changes.

This distinction matters because a lot of first-time investors assume a "big house purchase" and a "small apartment building purchase" are financed similarly, just at different price points. They're not. The underlying loan products, qualification criteria, and terms available are fundamentally different once you cross into commercial multifamily.

02How commercial loan terms typically differ

Commercial multifamily loans are built around different assumptions than the residential loans most people are familiar with, and the differences show up in several places.

Underwritten primarily on the property's income, not just the borrower. Residential mortgage underwriting leans heavily on the borrower's personal income, credit score, and debt-to-income ratio. Commercial multifamily underwriting shifts significant weight to the property itself, specifically its net operating income (NOI) and its debt service coverage ratio (DSCR), a measure of how comfortably the property's income covers its debt payments. A property with strong, stable income can sometimes qualify for financing even when the borrower's personal financial picture wouldn't clear residential underwriting on its own, and the reverse is also true, a strong borrower can't fully offset a property with weak or unstable income. For more on how this ratio is calculated and used, see our article on the debt service coverage ratio.

Shorter amortization, often with a balloon payment. Many commercial multifamily loans don't fully amortize over a 30-year term the way a typical residential mortgage does. It's common to see a loan structured with a shorter term, sometimes five, seven, or ten years, with payments calculated on a longer amortization schedule but a balloon payment due at the end of the term requiring the borrower to refinance or sell. This creates real refinance risk: if market conditions, interest rates, or the property's performance have shifted unfavorably by the time the balloon comes due, refinancing can be more expensive or harder to secure than originally planned.

Higher down payment norms. Commercial lenders generally expect a larger equity contribution from the borrower than residential lenders do, reflecting the larger loan sizes and the fact that commercial loans typically aren't backed by the same government guarantee programs available on smaller residential properties. Exact requirements vary by lender, property type, and market conditions, so it's worth treating any specific percentage you hear as a starting point for a conversation rather than a fixed rule.

More extensive underwriting and documentation. Expect commercial lenders to request detailed historical financial statements (rent rolls, profit and loss statements, tax returns for the property), a more thorough property inspection and appraisal process, and often a longer timeline to close than a typical residential purchase.

03A quick side-by-side

	Residential (1-4 units)	Commercial (5+ units)
Primary underwriting basis	Borrower's income and credit	Property's NOI and DSCR
Typical amortization	Often 30-year, fully amortizing	Often shorter term with balloon
Down payment norms	Lower, especially owner-occupied	Generally higher
Government-backed loan programs	Widely available (FHA, VA, conventional)	More limited, different programs
Refinance risk	Lower, if rate is fixed for the term	Higher, due to balloon structures
Documentation	Personal financials, standard appraisal	Property financials, rent rolls, detailed appraisal

04Why lender relationships and brokers matter more at this scale

Commercial lending is a less standardized, more relationship-driven market than residential lending. Rates, terms, and even willingness to finance a given property or borrower can vary meaningfully from one commercial lender to another, and the "shop around online" approach that works reasonably well for a residential mortgage is less effective here. A commercial mortgage broker who works regularly with multifamily lenders can often access a wider range of loan products, including community banks, credit unions, life insurance companies, and agency lenders (like Fannie Mae or Freddie Mac multifamily programs), than an individual investor could find independently.

An established relationship with a commercial lender or broker also tends to matter more over time than in residential financing, since commercial loans often need to be refinanced within a handful of years given typical balloon structures. Investors who plan to acquire multiple multifamily properties over time often find that building a track record with one or two commercial lenders makes subsequent financing smoother and, in some cases, unlocks better terms.

05Modeling the numbers before you commit

Because commercial multifamily loans are structured so differently from residential ones, running the numbers on amortization, payment size, and how a balloon maturity affects your long-term plan is worth doing carefully before making an offer. Our mortgage repayment calculator can help you model payment scenarios under different loan terms, though for a true commercial underwriting picture, you'll want to layer in the property's actual NOI and DSCR alongside standard payment math.

For a broader look at financing options across property types and investor situations, see our guide to investment property financing.