You can buy a fourplex with the same kind of loan you used on a single-family rental. Add two more doors and the financing changes underneath you. At five units, most banks stop treating the building as residential investment property and reclassify it as commercial real estate. Same investor, same neighborhood, often the same block. Different rulebook.
That reclassification is where a lot of scaling investors quietly stall. They find a strong six-unit, run the numbers on residential terms, and then watch the lender hand back a commercial term sheet with a balloon, full recourse, and a timeline that kills the deal. The asset was fine. The financing box was wrong.
The Financing Cliff Sits Between Unit Four and Unit Five
The 1-to-4-unit world is comfortable. Loans are asset-based or lightly documented, terms are long, and the process is familiar. Five units and up is where banks pull the building into their commercial group, and the commercial group underwrites differently.
Most investors do not see the cliff until they are standing on it. A $900,000 six-unit looks like a logical step up from a couple of fourplexes. The rent roll is stronger, the price per door is better, the upside is obvious. Then the financing arrives in a shape no one planned for, and the deal that penciled on residential math no longer pencils at all.
What Commercial Underwriting Costs You
The commercial path is not unavailable. It is just expensive in ways that do not show up as a single line item.
Commercial loans on small multifamily commonly run on shorter terms with a balloon, which means you are refinancing on someone else's clock, often into whatever conditions exist on that date. Recourse is usually full. The close stretches out while the file moves through a slower committee process. And the loan can carry repricing or call provisions that hand the lender leverage you would never accept on a 30-year rental.
For an investor whose whole model is acquiring, stabilizing, and holding, a balloon in five to ten years is not a footnote. It is a refinance you are forced into regardless of where values or your own balance sheet sit at that moment. The commercial box turns a long-term hold into a series of deadlines.
Five to Ten Units Can Be Financed Like the Investor Asset It Is
Here is the part the commercial term sheet does not tell you: a 5-to-10-unit building can be financed on investor terms. We lend on 5-to-10-unit properties through the same investor products that serve the 1-to-4-unit world, not a commercial committee.
For the acquisition, our Bridge product is asset-based and closes in as few as five days, which is what lets you move on a stabilized or recently renovated small multifamily building before a slower buyer catches up. Bridge runs up to 75% of value for qualifying borrowers, 65% on a cash-out. Then, once the building is stabilized and documented, our DSCR Rental product takes you out into a 30-year loan underwritten on the property's rent and value rather than your tax returns. On 5-to-10-unit files the DSCR program is more conservative than a single-family rental, with a higher coverage threshold and leverage that lands lower on the grid, but it is a true long-term loan with no balloon and no commercial call provisions.
The Two-Step Ladder on a Hypothetical Six-Unit
Here is the math on a hypothetical deal. Take an investor buying a $900,000 six-unit that is partially vacant and freshly renovated, the kind of building a bank's commercial desk would take weeks to touch.
Step one is a Bridge loan to acquire and stabilize. At up to 75% of value, that is roughly $675,000 in financing against the $900,000 purchase, with a close measured in days rather than weeks. The investor finishes lease-up over the next several months and gets the rent roll documented.
Step two is the DSCR takeout. With the building stabilized and appraising around $1,000,000, a qualifying 5-to-10-unit DSCR refinance into a 30-year term retires the Bridge and locks the hold. The leverage is set more conservatively than it would be on a duplex and the coverage requirement is higher, so the operator carries the deal to a clean coverage number before refinancing. No balloon, no committee, no call provision waiting on the calendar.
That is the same six-unit the commercial desk wanted to wrap in a five-year balloon, financed instead as what it is: an investor rental that happens to have six doors.
Key Takeaways
- The break point is unit five, not unit ten. The moment a building crosses from four units to five, most banks reclassify it as commercial, which is where balloon terms, full recourse, and slower closes enter the picture. Plan your financing around that line before you write the offer.
- Five-to-ten-unit buildings can be financed on investor products. A Bridge loan handles the fast, asset-based acquisition, and a 30-year DSCR loan provides the permanent takeout with no balloon, though both run at more conservative leverage and higher coverage than a 1-to-4-unit deal.
- Underwrite the small multifamily deal twice before you commit: once on the investor-financing ladder you intend to use, and once on the commercial terms your bank will actually offer. The gap between those two is the real cost of the trap.
If you are eyeing a five-to-ten-unit building and your bank is steering you toward a commercial balloon, there is another way to structure it. Certain Lending finances small multifamily through Bridge for the acquisition and DSCR for the long-term hold, underwritten on the asset, not a committee. Start at CertainLending.com or call (206) 451-1455 to map the two-step ladder on your specific deal.
