Most business owners I talk to assume a commercial mortgage works roughly like a residential one. Same basic idea, right? You find a property, you apply for a loan, you make monthly payments. That assumption has cost people I know real money, in wasted time, wrong loan structures, and deals that fell apart at the last minute because nobody explained the rules upfront.

Here’s what’s actually happening when you go after commercial real estate financing, and what you need to know before you walk into a bank or a broker’s office.

What Makes a Commercial Mortgage Different (And Why It Matters)

The short version: commercial mortgages are a different animal entirely from residential loans, and lenders treat them that way.

On the residential side, underwriters are primarily looking at you, your personal credit, your income, your debt-to-income ratio. On the commercial side, they’re looking at the property’s ability to generate income, your business’s financial health, and your personal finances as a secondary backstop. The property has to make sense as a business investment, not just as collateral.

A few concrete differences that catch people off guard:

The loan terms are shorter. Most commercial mortgages run 5 to 20 years, often with a balloon payment at the end. So you might have a 20-year amortization but a 10-year term, which means after 10 years you owe whatever’s left and you need to refinance or pay it off. This is standard. It still surprises people.

Down payments are bigger. Expect 20% to 35% down for most conventional commercial loans. SBA 504 loans can get you down to 10%, but there are restrictions on that (more in a minute).

Rates are generally higher than residential rates and float more. As of this year, commercial mortgage rates from conventional lenders are running roughly 6.5% to 9% depending on the property type, your creditworthiness, and the loan structure. That range is wide on purpose because it actually is that variable.

“Commercial real estate lending is fundamentally a business credit decision,” says David Bitner, former head of capital markets research at Cushman & Wakefield, with over 20 years in CRE. “Lenders are underwriting cash flow, not just collateral. If the property or business can’t demonstrate sustainable income, the loan doesn’t get done regardless of personal credit scores.”

That quote matters. If you’re buying a property your business will fully occupy, lenders will scrutinize your business financials closely, not just your personal tax returns.

Check out our guide on how to read a business financial statement before your first lender meeting so you’re not caught flat-footed.

The Main Loan Types You’ll Actually Use

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Loan TypeDown PaymentTerm LengthBest ForKey Requirement
Conventional Commercial20-35%5-20 yearsOwner-occupied or investment2-3 years business tax returns
SBA 50410%Fixed-rate CDC portion tied to TreasuryOwner-occupied property51% owner-occupied minimum
SBA 7(a)FlexibleUp to $5 million maxSmaller purchases, mixed-useGuarantee fee applies
CMBSTypically 20%+VariesLarger properties, investorsNot recommended for first-time small business owners

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There’s a lot of noise about commercial real estate financing options. I’m going to cut to the ones that actually matter for most small business owners.

Conventional commercial mortgages come from banks and credit unions. They’re relationship-driven loans, and this is where having a banking relationship before you need a loan pays off. Community banks are often more flexible than the big nationals for smaller deals (say, under $3 million). They’re going to want 2 to 3 years of business tax returns, personal tax returns, a current balance sheet, profit and loss statements, and a rent roll if the property has tenants.

SBA 504 loans are the workhorse for owner-occupied commercial real estate. The structure is a little unusual: a bank or credit union covers 50% of the project cost, a Certified Development Company (CDC) covers 40% backed by an SBA debenture, and you bring 10% down. The fixed-rate portion (the CDC piece) is tied to Treasury rates and has been one of the better deals out there for owner-occupied property. The catch is the property must be at least 51% owner-occupied, and the process is slower and more paperwork-heavy than a conventional loan. The SBA’s own small business resources page (sba.gov) has the current CDC list and eligibility requirements, but I’d also point you toward the IRS small business tax center for understanding how the loan structure affects your depreciation and interest deductions.

SBA 7(a) loans can be used for real estate but are better suited to smaller purchases or mixed-use financing (equipment plus real estate, for example). The max is $5 million, and the terms are flexible, but you’ll pay a guarantee fee.

CMBS loans (Commercial Mortgage-Backed Securities) are for larger properties and investors. If you’re a small business owner buying your first commercial property, this probably isn’t your path.

One thing I want to be direct about: bridge loans and hard money lenders exist, and they have a legitimate role in specific situations (property rehabilitation, fast closings, distressed purchases). But the rates are brutal, often 10% to 14%, and the terms are short. They’re a tool of last resort, not a financing strategy.

For a solid foundational read on commercial real estate finance, this copy of “The Complete Guide to Real Estate Finance for Investment Properties” by Steve Berges is dated but structurally sound on the fundamentals. The site may earn a commission on purchases.

Start your search with SBA.gov’s Lender Match tool to find CDC and 7(a) lenders in your area before approaching conventional banks.

How Lenders Underwrite Your Deal

This is where I see the most confusion, and honestly the most preventable loan rejections.

Commercial lenders use a metric called the Debt Service Coverage Ratio, or DSCR. It measures whether the property (or your business) generates enough income to cover the loan payments. The formula is simple: Net Operating Income divided by Annual Debt Service. Most lenders want a DSCR of at least 1.25, meaning the property generates $1.25 for every $1.00 in debt payments. Some require 1.35 or higher.

If you’re buying an investment property, the NOI comes from rents. If you’re buying an owner-occupied property, your business’s income effectively replaces rent. Either way, the number has to work.

“I’ve seen deals with strong borrowers fall apart because the property’s cash flow couldn’t support the debt load at the purchase price,” says Lisa Harrington, CPA and commercial real estate consultant with 15 years of practice in the Pacific Northwest. “Buyers sometimes over-pay for a property and assume the lender will accommodate. They won’t. The math has to work independently.”

The other big underwriting factors:

Loan-to-Value ratio (LTV). Lenders typically won’t go above 75% to 80% LTV on most commercial property types. Restaurants, gas stations, and single-use properties often get worse treatment, sometimes 65% or less, because they’re hard to repurpose if the business fails.

Your personal guarantee. Unless you’re a very large company or structuring a CMBS deal, you’re personally guaranteeing this loan. That’s standard. Don’t let anyone tell you otherwise.

Global cash flow analysis. Lenders will add up income from all your businesses and properties, then subtract all your personal and business debt obligations. This global picture can hurt you if you have other obligations, or help you if you have other income streams.

The Consumer Financial Protection Bureau’s small business resource center is worth bookmarking for understanding your rights as a borrower, particularly around disclosure requirements lenders must meet before closing.

Build your financial package before approaching any lender: 3 years of business and personal tax returns, YTD P&L, current balance sheet, and a one-page executive summary of the property and your business.

What the Process Actually Looks Like

Let me give you a realistic timeline, because “it varies” is useless advice.

Pre-approval or term sheet: 1 to 3 weeks after submitting your full package. Some community banks can move faster.

Appraisal: This is almost always required, and it’s ordered by the lender, not you. Commercial appraisals run $3,000 to $10,000 depending on property complexity. Budget for it.

Environmental review (Phase I): Required for most commercial transactions. A Phase I environmental assessment runs $1,500 to $4,000 and can take 2 to 4 weeks. If the Phase I flags anything, you may need a Phase II, and that can add weeks and several thousand dollars.

Underwriting: 3 to 6 weeks once the appraisal and environmental reports are in.

Closing: 1 to 2 weeks to prepare documents after underwriting approval.

Total realistic timeline from application to close: 60 to 120 days. I’ve seen SBA 504 deals take 4 to 6 months. Plan for the longer end. If a seller or your own business plan requires a faster close, talk to a bridge lender and understand the cost of that speed.

“The biggest mistake owner-occupants make is signing a purchase contract with a 45-day financing contingency when conventional commercial lending simply doesn’t move that fast,” says James Nakamura, senior loan officer at a regional bank in Northern California with 12 years in commercial lending. “You either need a longer contingency or you need to be very far along in pre-approval before you go under contract.”

I’d add: get a pre-qualification letter before you make an offer, and if possible get it from the lender you actually intend to use.

I’d also strongly recommend picking up a copy of NOLO’s “Every Landlord’s Legal Guide” if you’re buying investment or mixed-use property. The site may earn a commission.

Get a written term sheet from at least two lenders before choosing one, so you can actually compare rates, fees, and prepayment penalties side by side.

If you’re walking into this process cold, the single most valuable thing you can do before approaching any lender is build your financial package, understand your DSCR, and get honest about your down payment capacity. The borrowers who close cleanly aren’t smarter than anyone else. They just showed up prepared.

This article is for general informational purposes only and does not constitute financial, tax, or legal advice. Business finance and tax rules vary by entity type, state, and individual circumstances. Consult a qualified CPA, enrolled agent, or business attorney for advice specific to your situation.

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Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.