Why the Rules Change With Size
A first rental property and a tenth rental property do not get financed the same way. Lenders look at a single-family rental very differently than they look at a 20-unit apartment building. The difference is not just paperwork. It changes what loans are even available, how much cash a buyer needs on hand, and who is on the hook if the deal goes bad.
Investors who plan ahead for these shifts avoid getting stuck mid-deal. Investors who do not often find out the hard way that the loan they expected does not exist for the property they are trying to buy.
The One-to-Four Unit World: Conventional Financing
Up to four units, most lenders treat a rental like a residential purchase. That means conventional mortgages, FHA loans in some cases, and underwriting based heavily on the borrower’s personal income, credit score, and debt-to-income ratio.
This is the easiest financing an investor will ever get. Rates are usually lower. Down payments can be as low as 15 to 25 percent for an investment property. The property’s own performance matters, but the borrower’s personal financial picture still carries most of the weight.
This is also where most new investors start, and for good reason. It is the most forgiving entry point into owning real estate.
Five Units and up: Commercial Lending Takes Over
Once a property hits five units or more, it is no longer a residential loan. It becomes commercial real estate, and the underwriting flips. Lenders care less about the borrower’s W-2 income and far more about the property’s own numbers: net operating income, debt service coverage ratio, occupancy history, and the quality of the rent roll.
This is a real line, not a soft guideline. An investor who has only bought duplexes and fourplexes often finds the jump to a 20-unit building feels like dealing with an entirely different industry, because in lending terms, it is one.
Down payments on commercial multifamily deals typically run higher, often 25 to 35 percent, and loan terms are shorter, frequently five to ten years with a balloon payment instead of a 30-year amortization.
Recourse Versus Non-Recourse Debt
Another shift that comes with scale is the recourse question. Smaller residential loans are almost always full recourse, meaning the borrower is personally liable if the loan defaults. Larger commercial multifamily loans, especially from agency lenders, can be structured as non-recourse, meaning the lender’s claim is mostly limited to the property itself.
Non-recourse debt sounds safer, and in some ways it is. But it usually comes with stricter “bad boy” carve-outs that bring personal liability right back if there is fraud, misrepresentation, or certain kinds of mismanagement. Investors need to read these carve-outs closely rather than assume non-recourse means risk-free.
Reserve and Underwriting Expectations Change Too
Lenders financing a single rental might ask for two to six months of mortgage payments in reserve. Lenders financing a 50-unit property often want six to twelve months of operating expenses sitting in a reserve account before they will close, plus a capital expenditure reserve funded at closing for near-term repairs.
This is one of the most common surprises for investors scaling up for the first time. The purchase price and down payment are not the whole story. The reserve requirement alone can add tens of thousands of dollars to what is needed at the closing table.
Insurance and Entity Structure Shift With Size
Insurance follows the same pattern. A landlord policy on a single rental is a fairly simple product. A commercial property policy on a larger asset involves loss-of-rents coverage, higher liability limits, and sometimes flood or windstorm riders depending on location. Lenders at this level will specify exactly what coverage they require before they fund.
Entity structure tends to shift too. Many investors hold a few single-family rentals personally or in one LLC. Once deal sizes grow, lenders and attorneys usually recommend a separate entity per property, both for liability reasons and because lenders prefer a clean, single-asset borrower structure.
Working With Someone Who Has Made the Jump
Because the lending world changes so much at the five-unit threshold, investors moving from small rentals into larger multifamily deals often work with someone who has already made that transition. Jonathan Cronin, co-founder of REI Accelerator, works with investors on multifamily and apartment deals, including the financing and capital side of scaling a portfolio past the residential lending world.
The biggest mistake is assuming the next deal will finance the same way the last one did. It usually will not, and the investor who checks this early has far more room to negotiate than the one who finds out at the underwriting stage.
