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The most efficient way to scale door-count without leaving agency pricing. Sixteen units at conventional rates is on the table — if you know how to play it.
Once you understand how Fannie Mae counts properties, the 2-4 unit math gets compelling fast. The agency 10-financed-property cap counts each parcel as one property — not each unit. So a duplex is one property. A fourplex is one property. Buy four fourplexes and you own sixteen rentable doors at agency pricing, with only four of your ten conventional slots used. For investors who care about scaling income per slot rather than buying the most properties possible, 2-4 unit is the highest-leverage product on the menu.
The trade-off is the down payment. Single-family NOO is 15% down. 2-4 unit NOO is 25% down — a $400K duplex requires $100K rather than $60K to close. The math still favors the multifamily play if the property cash-flows hard enough, but the cash demand at the front end is real and the borrower needs reserves to match.
What it actually is
Conventional NOO 2-4 unit is the same Fannie Mae/Freddie Mac investment-property framework as the 1-unit product, scaled up to small multifamily — duplex, triplex, and fourplex. Five units crosses into commercial multifamily underwriting (a different conversation entirely with different lenders, longer timelines, and DSCR-style underwriting on the asset itself).
Rental income is calculated on every unit. On a purchase, the appraiser estimates market rent for each unit on Form 1025 (the small-residential-income property appraisal report) plus rent comps. Total gross rent is then haircut by the agency-mandated 25% vacancy/maintenance assumption — so 75% of total rents adds to qualifying income. On a refinance, Schedule E from tax returns is the source.
Vesting must be in personal name, same as 1-unit conventional. Same ten-property cap, same reserves rules, same documentation standards.
Who it is built for
- Door-count scalers buying duplexes and fourplexes instead of stacking single-family rentals
- House-hack exits — primary-residence 2-4 unit converting to NOO when the borrower moves out
- Refinances of small multifamily portfolios consolidating into agency pricing
- Investors with strong reserves who want to deploy more capital per slot against the 10-property cap
- Move-up buyers who originally bought a duplex as a primary, lived in one side, and now want to convert it to pure investment
The basics
- Minimum down payment: 25% on a purchase (LTV cap 75%). Higher than 1-unit but offset by stronger rental income from multiple units.
- Cash-out refinance LTV cap: 70% — slightly tighter than 1-unit cash-out (75%).
- Minimum credit score: 680 (700+ for tightest pricing tier).
- Reserves: 6 months of PITIA per financed property. PITIA on a fourplex is naturally higher than a single-family, so the reserve figure is meaningful.
- Counts toward 10-property cap: Yes, one property per parcel — not per unit. A fourplex = one slot.
- Rental income haircut: 25% (agency-mandated vacancy/maintenance assumption applied to total gross rents from all units).
- Eligible property types: 2-unit, 3-unit, and 4-unit residential. 5+ units crosses into commercial multifamily.
- Loan limits (2026): Conforming limits scale with unit count. A 4-unit conforming limit in a high-cost area can exceed $2.4M.
Three things to know going in
Insider Insight #1 — A fourplex is one financed property. Plan accordingly.
Most investors discover this fact too late and regret stacking single-family rentals before learning multifamily existed. Each fourplex you buy uses one of your ten agency slots and gives you four rentable doors. Mathematically, the most agency-efficient portfolio possible is ten fourplexes — forty doors at conventional rates. Almost no investor pulls this off, but understanding it shapes every property selection from your first purchase onward.
Insider Insight #2 — House-hack exits are an unfair advantage.
If you bought a 2-4 unit as a primary residence with 5% down conventional or 3.5% FHA, you originally got owner-occupied terms. After you fulfill the occupancy period and move out, the property becomes investment property — but you do not have to refinance it. The original loan stays in place at its original (better) terms. Free agency-priced multifamily, locked in.
Insider Insight #3 — The 25% rent haircut hurts cash-flow-tight files.
Agency rules force lenders to use only 75% of gross rents toward qualifying income, even when the property has been leased to the same tenants for eight years with no vacancy. On a marginal file, that haircut is the difference between approval and denial. If your DTI is tight, expect to either bring more reserves to compensate or pivot to DSCR.
Real-world scenario
A self-employed investor in Hollywood, FL purchases a $620K fourplex with each of the four units producing $1,650/month gross rent — $6,600 gross monthly. He puts 25% down ($155,000), finances $465,000 at 2-4 unit NOO pricing, and the lender adds 75% of $6,600 ($4,950) to his qualifying income on top of his Schedule C net. Reserves required: 6 months of PITIA on a roughly $4,000 monthly payment = $24,000. Total cash to close: $155K down + ~$15K closing + $24K reserves = $194K. Property cash-flows roughly $1,500 a month after debt service, taxes, insurance, and a 25% reserve for maintenance — and the file used one of his ten agency slots, not four.
Quick FAQ
Can I count rent from all four units even if some are vacant?
On a purchase, yes — the appraiser estimates market rent on every unit regardless of current occupancy, and 75% of that total counts toward qualifying income. On a refinance with documented Schedule E history, the lender uses actual rents.
Why is the down payment 25% when 1-unit is only 15%?
Multifamily properties carry slightly higher default risk in agency loss modeling — concentration risk if one tenant moves out is bigger when there are only 2-4 units, vacancies tend to cluster, and the asset is more specialized to liquidate. The 10% down payment delta reflects that risk modeling.
Can I do an FHA loan on a 2-4 unit and treat it as investment?
Not at origination. FHA requires owner-occupancy on the original loan — you have to live in one unit for at least one year. After that occupancy period, the property can convert to pure investment without refinancing, and you keep the original FHA terms.
How does a fourplex appraisal work?
The appraiser uses Form 1025 (Small Residential Income Property Appraisal Report) instead of the standard 1004 used on single-family. Sales comps for 2-4 unit properties are scarcer than single-family, so expect the appraisal to take a bit longer.
Free pre-approval. Soft credit pull. Zero hit to your score.
Before you make an offer, you need to know what the bank will actually back you on. A real pre-approval — not a quick online estimate — gives you the loan amount, the program, the rate range, and the monthly payment in writing. We pull a soft credit report (no impact to your score), review your income and reserves, and run the deal through underwriting logic so you walk into a property tour or a 1031 exchange knowing exactly what you can close on.
For investors, this matters double. Listing agents on rental properties take cash buyers and pre-approved investor offers seriously — everyone else gets passed over. Get the pre-approval first, then go shopping with leverage.
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Aleksandra Vasic — Mortgage Loan Originator, NMLS #[YOUR NMLS HERE] | True Blue Lending NMLS #2380218 | Equal Housing Opportunity. This is not a commitment to lend. All loans subject to credit approval.