Yes — a small apartment building qualifies largely on the building’s own income, not your salary or tax returns. Whether it’s a duplex or a twelve-unit, the rent roll sits at the heart of the file. However, one number decides how a lender underwrites it: the unit count.
The line that changes everything: 2–4 units vs. 5+
- Two to four units counts as residential. It qualifies the way other income-based investment loans do, so the lender compares the rents against the payment (the DSCR).
- Five units and up is commercial multifamily. Instead of your income, the lender looks at the building’s net operating income (NOI). NOI means rents minus operating expenses, and the lender weighs it against the debt. Different box, same principle: the property has to carry itself. In fact, Fannie Mae multifamily programs follow the same logic.
First, find which side of that line your building falls on. That tells you which rules apply before you go any further.
How the building’s income qualifies it
For a 2–4 unit, the math mirrors any DSCR loan. You divide the rent by the payment — principal, interest, taxes, insurance, and any HOA. The rent means actual leases, or market rent from the appraiser. In practice, most programs want a ratio of at least around 1.0 to 1.25.
For 5+ units, the lender works from NOI divided by the annual debt payment. That’s the commercial DSCR. As a result, lenders typically look for something in the neighborhood of 1.20 to 1.25 or better.
Either way, the rent roll — the list of units, leases, and rents — does the heavy lifting. In-place rents count when a unit already has a tenant. Meanwhile, an appraiser’s market rents fill in where a unit sits vacant or under-rented.
What you bring to the table
- Down payment. Typically around 20%–25% on a 2–4 unit, and often 25%–30% on 5+ unit commercial.
- Reserves. A cushion of a few months’ payments, scaled to the size of the building.
- Credit. Your score still has to clear the program’s floor.
- Personal income. Not the qualifier. Instead, the building’s income is.
Why investors step up to multifamily
More units under one roof means more income supporting a single loan, a single closing, and one property to manage. For an investor who has outgrown single-family rentals, a small apartment building is the natural next move. As a result, the income-based structure is what makes the jump financeable.
Buying from outside the U.S.?
The same building-income logic also works for foreign national investors. The apartment building qualifies on its own rents. So a lack of U.S. income or U.S. credit isn’t the wall it would be on a conventional loan.
A typical small apartment building deal
A scenario I see often: an investor buying a fully leased six-unit. We take the rent roll and work the net operating income against the debt. Then we confirm it clears the DSCR, and it closes on commercial terms. In short, the investor’s personal income never becomes the gate — the building’s performance carries the loan.
Ready to look at your building?
Whether it’s a duplex or a twenty-unit, the fastest answer comes from running the actual rent roll. Tell us about your deal and we’ll size it — in English or Spanish.
By Andres Jara — Alpha Equity Lending (NMLS #1855083). 20+ years in real estate finance, an MS in Finance, and an active South Florida investor and landlord.
