Small Multifamily
(2–4 Units)

Why 2–4 units qualify for residential terms

Residential financing (Fannie Mae, Freddie Mac, FHA, VA) covers 1–4 units. Commercial financing (bank portfolio, Fannie DUS, Freddie Optigo, CMBS) picks up at 5+. The difference shows up everywhere:

• Down payment. FHA 203(b) 3.5% owner-occupied. Conventional owner-occupied 5%. Non-owner-occupied conventional 15–25%. Commercial (5+) 25–35%.
• Amortization. Residential 30-year fully amortizing. Commercial typically 25-year amortization with 5, 7, or 10-year balloons.
• Rate. Residential fixed at conforming rates. Commercial prices 100–200 bps above equivalent residential.
• Underwriting. Residential uses DTI on borrower income. Commercial uses DSCR on property NOI.

House-hacking math

The house-hack is the highest-leverage entry point in residential real estate. Live in one unit, rent the others, qualify for owner-occupied financing. Worked example on a $600,000 triplex:

FHA 203(b) 3.5% down:
  Down payment:          $21,000
  Loan amount:          $579,000
  Rate (2026):              6.5%
  P&I:                   $3,660
  Taxes (1.2%):            $600
  Insurance:               $200
  MIP (FHA monthly):       $280
  PITI:                  $4,740

Rent from other 2 units: $3,600
Net housing cost:        $1,140
vs. renting comparable:  $2,200
Monthly savings:         $1,060

After 12 months of owner-occupancy (lender lease and utility-bill verification), the investor moves out, rents the third unit for another $1,800/month, and now owns a cashflowing triplex acquired with $21,000. Violation of the 12-month occupancy requirement triggers due-on-sale under Garn-St. Germain, 12 U.S.C. § 1701j-3.

Analysis — reject the 1% rule

The 1% rule (monthly rent ≥ 1% of purchase price) is a relic of 2010–2015 markets. In 2026, urban and near-urban 2–4 unit properties yield 0.5–0.8%. That doesn’t mean they’re bad deals — it means the screening metric has to evolve:

• GRM (Gross Rent Multiplier). Price ÷ annual gross rent. Target ≤ 12 in most markets; ≤ 8 in high-yield tertiary markets.
• 50% rule. Long-run operating expenses (ex-debt) average 50% of gross rent. Validate with actual P&L — taxes, insurance, vacancy, maintenance, reserves, management.
• Cash-on-cash return. Annual cashflow ÷ cash invested. Owner-occupied house-hacks show 40%+ because the "cashflow" includes rent savings; pure investor deals target 8–12%.
• DSCR stress test. Even with residential financing, run the NOI ÷ debt service. If you can’t clear 1.15 after moving out, you bought wrong.

Income approach vs. comp approach

Residential 2–4 unit appraisals use both. The 1025 Small Residential Income Property Appraisal reconciles them:

• Sales comparison. 3–6 recent sales of similar units in the same submarket. Adjusted for size, condition, and income.
• Income approach. GRM × annual gross rent, or NOI ÷ cap rate. Appraiser derives market GRM from comparable sales.

The appraised value is typically weighted 70% comps / 30% income for owner-occupied, reversed for larger investor-owned. Seller pro formas inflate rents 15–20% above actual; verify with Rentometer, Zillow Rent Zestimate, and actual leases.

Utilities — separately metered is gold

Separately metered utilities shift $200–400/unit/month of cost from owner to tenant. That’s $7,200–19,200/year of unencumbered NOI on a 3–4 unit building. Master-metered buildings require RUBS (Ratio Utility Billing System) to recover costs from tenants — legal in 40 states, banned in TX/CA for water.

Re-metering a master-metered building costs $5,000–10,000/unit and requires code-compliant wiring, shutoffs, and meters. ConEd and PG&E offer rebates up to $1,500/unit for electric separation. Sewer/water is typically one line and impossible to separate; RUBS is the workaround.

Laundry adds $1,000–2,000/year per stacked unit. Coin-op 40% margin; app-based (Laundryheads, PayRange, WASH) boosts margin 25% via dynamic pricing.

Self-manage vs. hire — the threshold

Self-manage if the property is within 30 miles, unit count < 10, and your hourly value is below the PM fee. A 4-unit at $5,000/month rent runs $400–500/month in PM fees at 8–10%. If you spend 8–10 hours/month on the property, that’s $40–50/hour of actual value. For most investors, self-manage up to 10 units, then hire.

Property managers earn 8–10% of collected rent, plus 50–100% of first month on new leases, plus maintenance markup 10–20%. Screen PMs on: trust account separation, E&O insurance, state licensing (required in most states), reference checks, fee transparency, and scope of services.

Landlord-friendly vs. tenant-friendly jurisdictions

State law determines whether a small multifamily is a business or a hostage situation. The divide:

• Landlord-friendly (TX, FL, GA, TN, AL, IN, KY). 3–10 day pay-or-quit notice, no rent control, 21–45 day eviction timeline, no source-of-income mandates.
• Tenant-friendly (CA, NY, NJ, OR, MA, WA, MN). 30–90 day notice, rent control in multiple municipalities, just-cause eviction, 60–180 day eviction timelines, source-of-income protected (Section 8 acceptance mandatory).
• Hybrid (CO, IL, DC, VA). Some state-level protections, local variation.

Eviction timeline directly drives risk-adjusted return. A 3-day notice Texas eviction costs $500 and takes 30 days. A New York City rent-stabilized eviction can take 12+ months and cost $20,000+ in legal fees. Price your cap rate accordingly — a 6% cap in NYC often yields 4% after real-world collection loss.

Exit strategies

• Refinance to commercial. After 12 months seasoning, refinance into a portfolio lender (Kiavi, Lima One, Visio, CoreVest) at 70–75% LTV. Pull out trapped equity, buy next.
• Sell to owner-occupant. FHA-eligible buyers (3.5% down) bid a premium of 10–15% over investor comps. List as "house-hack-ready."
• 1031 into larger multifamily. Defer gain, roll equity into 5+ unit commercial or portfolio of SFRs.
• Blanket loan consolidation. Once you hold 5+ small multifamilies, refinance into a single blanket loan for easier management and potential rate improvement.

Common pitfalls

• 60-amp electrical panels. Pre-1965 construction. Modern 2023 NEC requires 100A minimum. Insurance companies refuse coverage. Upgrade $8,000–15,000.
• Knob-and-tube wiring. Pre-1940. Uninsurable by most carriers. Full rewire $15,000–25,000/unit.
• Galvanized plumbing. Pre-1960. Corrodes from the inside, water pressure drops, pinhole leaks follow. Full repipe $8,000–15,000 per unit.
• Lead paint (pre-1978). RRP rule applies to any renovation disturbing painted surfaces. EPA fines up to $37,500/day. Abatement $2,500/unit minimum.
• Asbestos (pre-1980). Siding, floor tiles, pipe insulation. OSHA 1926.1101 requires licensed abatement. Budget $10,000–20,000 for whole-building abatement.
• Illegal conversions. The "4-unit" advertised is a 2-unit with two basement units illegally carved out. Check Certificate of Occupancy (C/O). Illegal units face demolition orders and insurance denial.
• Mixed-use zoning traps. First-floor commercial + upper-floor residential switches financing from residential to commercial. Triples down-payment requirement overnight.
• Owner-occupancy violation. Moving out before 12 months on an FHA or conventional owner-occupied loan is mortgage fraud and a due-on-sale trigger. Don’t game this.