If you’ve owned a home, a duplex, or even a small rental, you already know the residential drill: the lender pulls your credit, checks your salary, works out your debt-to-income ratio, and decides whether you can carry the loan. Your first small commercial or 5-plus-unit multifamily building runs on a different engine, and the sooner that clicks, the fewer surprises you’ll hit.
Here is the whole shift in one line: commercial and 5+ unit multifamily loans underwrite the property’s income first and you second. The building has to prove it can pay its own mortgage. You still matter — your credit, your cash, your experience — but you’re the backup singer now, not the lead. This guide walks the four things that actually change, what a first deal really costs, and the mistakes that trip up almost every first-timer.
The residential-to-commercial shift
On a house, the loan is about your paycheck. On a commercial or 5+ unit building, the loan is about the building’s net operating income — rent collected, minus the real cost of running the place. The lender divides that income by the annual loan payment to get a debt-service coverage ratio (DSCR), and they want it comfortably above 1.0 — typically 1.20 to 1.25. Your personal debt-to-income ratio, the number that ruled your mortgage, barely comes up.
The terms feel different too. Residential mortgages amortize for 30 years at a fixed rate you can hold forever. Commercial loans are usually shorter — a 5, 7, or 10-year term, often amortized over 20 to 25 years, which means a balloon: the term ends before the loan is paid off, and you refinance or sell to clear the balance. Expect a larger down payment, too — commonly 25% to 35% down versus the 3–20% you may be used to.
One more word you’ll meet: recourse. Most first commercial loans are recourse — you personally guarantee them, so the lender can come after your other assets if the deal fails. Non-recourse loans (the lender’s only remedy is the building itself) exist, but they’re generally for larger, stabilized deals with experienced sponsors. As a first-timer, plan on signing a personal guarantee.
What first-timers actually buy
You’re probably not buying a downtown tower. First commercial deals cluster in a few honest, learnable shapes:
- Small mixed-use — a storefront or two on the ground floor with apartments above. Diversified income, but you’re now a small-commercial and residential landlord at once.
- Small apartment building — 5 to 20 units. The moment you cross 5 units, it stops being a residential loan and becomes commercial multifamily, underwritten on the rent roll.
- Owner-occupied commercial — you run your business out of the ground floor (or the whole building) and the mortgage replaces your rent. This is often the easiest first deal to finance.
Why owner-occupied can open better doors
If you’ll occupy the majority of the building with your own business (commonly 51%+ for commercial), you unlock financing paths that pure investors don’t get — most notably SBA loans. An SBA 504 or SBA 7(a) can put you into an owner-occupied building with a much smaller down payment — often around 10% — because the government guarantee lets the lender take a first-timer with less cash.
The trade is that SBA loans come with more paperwork, occupancy rules, and their own fees, and they’re for owner-occupants, not passive rentals. But for an owner who’s tired of writing a rent check to someone else, buying the building you already operate in is frequently the cleanest way into commercial real estate — and the lender is lending partly against your business’s cash flow, not just the property’s.
What to have ready before you shop
- Down payment plus reserves. The down payment gets you in; the reserves keep you in. Lenders increasingly want to see months of mortgage payments in the bank after closing.
- A rent roll or an income plan. For a building with tenants, get the actual rent roll and leases. For owner-occupied, be ready to show your business can cover the payment.
- An entity. Commercial property is usually bought in an LLC, not your personal name. Set it up early — lenders will ask who the borrower is.
- A realistic renovation budget. If the building needs work to hit its income (a value-add deal), price the work honestly and add a contingency. The gap between your budget and reality is where first deals get painful.
What a first deal really costs
Illustrative only — your market, the building, and your lender all move these numbers. But the shape shows the two things first-timers underestimate: how much cash walks in the door, and whether the income actually clears the loan.
| Purchase price | $1,000,000small mixed-use or 6-unit building |
|---|---|
| Down payment | $300,00030% down — investor commercial |
| Loan amount | $700,000the 70% the lender finances |
| Building’s NOI (annual) | ~$78,000rent collected minus real operating costs |
| Annual loan payment | ~$62,000illustrative rate + amortization |
| Resulting DSCR | ~1.26$78k ÷ $62k — clears a ~1.20–1.25 bar |
The income supports the loan — DSCR near 1.26 is the kind of number a lender wants to see. But look at the cash: $300,000 down is only the start. A lender will likely want reserves on top — several months of payments, call it another $15,000–$30,000 sitting in the bank after you close, plus closing costs and any renovation budget. The number that ends the deal isn’t the down payment. It’s the down payment plus everything you need in reserve the day after.
What changes from the loan you already know
Residential loan (what you know)
- Underwrites your income — salary, credit, debt-to-income.
- Small down payment — often 3% to 20%.
- 30-year fixed, fully amortizing, no balloon.
- The loan lives or dies on your financial profile.
Commercial / 5+ unit loan (what’s different)
- Underwrites the building’s income first — DSCR, not your DTI.
- Bigger down payment — commonly 25% to 35%.
- Shorter term with a balloon — refinance or sell before it’s due.
- Usually recourse — you personally guarantee it, and reserves matter.
Common questions
- How much do I need to put down on my first commercial or multifamily building?
- For an investor buying a small commercial or 5+ unit building, plan on 25% to 35% down. If you’ll occupy the building with your own business, an SBA loan can drop that to around 10%. Either way, budget for reserves and closing costs on top of the down payment — the cash you actually need is higher than the down payment alone.
- Does my personal income still matter on a commercial loan?
- It matters, but it’s no longer the main event. The lender underwrites the building’s income first — the property has to show it can cover its own mortgage through the debt-service coverage ratio. Your credit, net worth, and experience are checked as backup, and on most first deals you’ll sign a personal guarantee, so you’re still on the hook. You’re just not the primary source of repayment the way you were on a home loan.
- What does "owner-occupied" mean, and does it help me get financed?
- Owner-occupied means you run your own business out of the building — typically occupying at least 51% of the commercial space. It helps a lot: it unlocks SBA financing with a much smaller down payment (often near 10%), because the lender can also lean on your business’s cash flow, not just the property’s rent. For an owner tired of paying rent, buying the space you operate in is often the easiest first commercial deal to finance.
- Can I use an SBA loan to buy my first building?
- Yes, if you’ll occupy enough of it with your own business — generally 51%+ for existing commercial property. SBA 504 and 7(a) loans are built for owner-occupants and allow low down payments, which makes them a common on-ramp for first-timers. They come with more paperwork, occupancy rules, and their own fees, and they don’t work for a purely passive rental where you’re not the operating business.
- What’s the smallest amount I can borrow for a commercial deal?
- Many commercial lenders set a floor — often somewhere around $250,000 to $500,000 — below which a deal isn’t worth their underwriting cost. Very small buildings can fall into a gap: too big for a residential loan, too small for some commercial desks. If your deal is modest, look for community banks, credit unions, or SBA lenders that specialize in smaller commercial loans, and expect the term shopping to take a little longer.
- Should my first deal be a value-add or an already-stabilized building?
- For a first deal, a stabilized building — already leased and cash-flowing — is usually the safer teacher. The income is real, the loan is easier to get, and you learn the business without also managing a renovation. Value-add deals can pay off, but they lean on a renovation budget and a lease-up plan going right, and first-timers routinely underestimate both. If you take value-add early, keep the scope small and the contingency generous.
- What’s the balloon everyone warns about, and why does it matter?
- Commercial loans usually have a term shorter than their amortization — say a 7-year term amortized over 25 years. When the term ends, the remaining balance comes due all at once: the balloon. You clear it by refinancing or selling. It matters because you’re committing today to being able to refinance in a few years, and if rates or the building’s income have moved against you by then, that refinance can be hard. Underwrite the balloon before you sign, not when it’s due.