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Conventional commercial mortgage or SBA 504

By Klark Sparks  ·  September 14, 2026  ·  7 min read

The short answer

Conventional commercial mortgages typically want a larger deposit, run shorter terms and often end in a balloon. SBA 504 requires less down, offers a long fixed portion and removes much of the refinancing risk. Conventional is faster and simpler; 504 is usually cheaper in the ways that affect a small business most.

Part of our guide to Commercial Real Estate — what it is, what it costs, and who it suits.

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Both finance a building. The differences between them are where a small business either builds equity comfortably or spends a decade worrying about a refinance.

Deposit

The headline difference. Conventional commercial lending wants a substantial share of the purchase price from you. SBA 504 is structured specifically to require less for owner-occupied property, which is the reason the programme exists.

For a business with strong cash flow and limited spare capital — which describes most successful small businesses — that difference decides whether the purchase is possible at all.

Term and the balloon

This matters more than most buyers realise at the time.

Conventional commercial mortgages frequently amortise over a long period but mature much sooner, leaving a balloon payment. Practically, that means you are scheduling a refinance for yourself several years out, on terms and in conditions nobody can predict.

The 504 structure gives a long fixed term on the development company portion, which removes much of that risk. For a business that intends to occupy a building for decades, eliminating a forced refinance is worth a great deal — arguably more than a fraction of a point on the rate.

If you are offered a conventional commercial mortgage, ask when it matures, not just how it amortises. A twenty-five year amortisation maturing in seven is a seven-year loan with small payments and a very large final one.

Rate structure

Conventional lending often means a rate fixed for an initial period and then reset, or a variable rate throughout. The 504 development company portion is typically fixed for its full long term, with the bank portion on its own terms.

So part of your debt is insulated from rate movement for decades. For a business where a payment increase would genuinely hurt, that certainty has a value that does not show up in a rate comparison.

Speed and complexity

Conventional wins here, and it is a real advantage. One lender, a simpler process, a faster close. A 504 involves a bank and a Certified Development Company, and the coordination adds weeks.

If a seller needs a short close, that may decide it. Just be clear about what the speed is costing you in deposit and refinancing risk.

Occupancy

504 requires owner-occupancy of a defined majority of the building. Conventional commercial lending is more flexible and will finance investment property, which 504 will not. If you are buying something you intend to lease out substantially, the choice makes itself.

How to decide

  • Staying put for a long time, deposit-constrained, want payment certainty: 504.
  • Need to close fast, have plenty of capital, or the property is partly investment: conventional.
  • Buying and renovating together: 504 often covers both, which is worth checking before splitting the work.
  • Not sure whether the business stays: neither, yet. Renting for another cycle is a legitimate answer.

One practical point: not every lender does both, and a lender that only writes conventional will frame your options around conventional. Asking directly how many 504 deals they closed last year tells you whether you are getting a full picture.

Common questions

Is SBA 504 always cheaper?
Not always on rate, and usually better on deposit and term length. For a small business, deposit and payment certainty typically matter more than a small rate difference, but the comparison is worth doing properly for your numbers.
Can I use 504 for a building I will partly lease out?
Up to a point — you must occupy a defined majority. The exact requirement varies between existing buildings and new construction. Confirm before committing to a property with substantial tenanted space.
What happens at a conventional balloon?
You refinance, sell, or repay it. Refinancing depends on conditions and your position at that time, neither of which you control. It is the single biggest argument for the 504 structure.
How much slower is a 504?
Weeks rather than months of difference, because two institutions are involved. Worth planning around rather than worth avoiding, particularly given what the extra time buys.

Want this applied to your actual numbers?

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