Beyond the Fourplex: Financing 5–10 Unit Multifamily and Mixed-Use

Your investor client just went under contract on a six-unit building. The conventional answer is that you can't help — residential financing caps at four units, so it's a commercial loan now, go find a bank. That answer costs you the deal, the relationship, and every future file from a client who's clearly scaling. The better answer: several Non-QM investors write 5–10 unit multifamily using DSCR logic, and the process looks much more like the residential file you already know than like a commercial committee.

Why the fifth unit changes everything

The four-unit line is a regulatory and secondary-market convention, not a property-quality judgment. A well-run six-unit is often a safer asset than a single-family rental — five tenants can't all vacate the same week. But because agency channels stop at four, everything above it historically routed to commercial lending: relationship banking, in-house committees, shorter terms, balloon structures, and personal guarantees. Non-QM investors saw the gap and built products that treat small multifamily like scaled-up DSCR: 30-year terms, no personal income documentation, entity vesting, and a defined guideline matrix instead of a committee's mood.

The ratio math is different — respect it

On a single-family DSCR, you divide gross rent by PITIA and you're done. On 5–10 units, most investors underwrite to net operating income: gross scheduled rent, less a vacancy factor (commonly 5%), less operating expenses (management, maintenance, utilities the owner pays, reserves — often estimated at 25–35% of gross if actuals aren't credible). That NOI is what gets divided by the debt service. A building grossing $9,000 a month doesn't service debt like $9,000 — it services like $5,800 after the haircut. Quote the gross number to your client and you'll be revising the approval later, which is the worst conversation in this business.

• Get a real rent roll: unit mix, current rents, lease expirations, and which units are actually occupied today.
• Get trailing twelve months of operating statements if the seller has them — actuals beat estimates and often improve the file.
• Confirm the vacancy and expense factors your investor applies before you model anything for the client.
• Ask about below-market rents — some investors will underwrite to market rent with an appraiser's support, which can rescue a thin file.

Mixed-use: the rules of thumb

A building with a coffee shop on the ground floor and four apartments above is exactly the property most LOs assume is unfinanceable. Several Non-QM investors take it. The common threshold is that residential square footage must dominate — 51% or more is the frequent line, though some require 60% or 65%. Beyond the square footage test, underwriters look hard at the commercial tenant: what's the business, how long is the lease, is it a national or local tenant, and would the space re-let easily? A dentist on a seven-year lease reads very differently than a vape shop on month-to-month. Certain commercial uses get excluded outright — automotive with fuel tanks, cannabis, and anything with environmental exposure are common carve-outs.

What to expect in the box

Plan on lower leverage than single-family DSCR — typically 70–75% LTV, sometimes 65% on mixed-use. Reserves run higher, often six to twelve months of debt service. Minimum loan amounts are usually meaningful, since the underwriting work doesn't scale down profitably. Entity vesting is standard and usually preferred. And the appraisal will be a different animal: expect a narrative or small-income-property format with rent comparables, which takes longer and costs more than a residential 1004. Set that timeline expectation on day one.

Why this is worth learning

Every serious investor client eventually outgrows single-family. The LO who can follow them from a duplex to a six-unit to a mixed-use building keeps the relationship for a career; the LO who taps out at four units hands their best client to a commercial broker who will happily take the rest of their business too. You don't need to become a commercial lender — you need to know which of your Non-QM investors go past four units and what their NOI math looks like. Run the building through the Scenario Desk with the unit count and rent roll and it will tell you who fits, with the guideline citation.