SBA 504 vs a conventional commercial mortgage for owner-occupied real estate

Two ways to finance the same building

A conventional commercial mortgage is one loan from one lender, secured by the property, underwritten on the building's value and the business's ability to pay. The lender sets the down payment, rate, term and prepayment terms under its own policy. Because it carries the whole loan, it usually lends a smaller share of the price than 504 does, and it limits how long it will fix the rate.

An SBA 504 project splits the same building into three pieces. A bank lends typically 50% of the project cost on a first lien. A Certified Development Company (CDC), a nonprofit licensed by SBA, lends typically 40% on a second lien, funded by an SBA-guaranteed debenture sold to investors. The borrower puts in typically 10%, rising to 15% for a new business or a special-purpose property and 20% for both. The CDC's share goes up to $5 million, or $5.5 million for manufacturers and energy projects; the bank's share has no program cap.

The bank in a 504 deal is lending half the project with the borrower's equity and the CDC's second lien beneath it. That is a safer position than a conventional mortgage lender's, which is why banks are willing to lend on 504 first liens at competitive terms. For how 504 compares with SBA's other program, see SBA 7(a) vs SBA 504.

The cash difference, worked through

Take a building with a total project cost of 2,000, including closing and soft costs, bought by an established business in a general-purpose property. Suppose the conventional lender offers to lend 1,500.

The 300 of cash kept in the business is the core of the 504 argument. For a growing company it can fund receivables, inventory or equipment that would otherwise need their own financing, and it keeps the balance sheet liquid enough that the company's working-capital lender stays comfortable. For a company already holding plenty of cash, the same 300 matters less, and the simplicity of one lender may be worth more.

504 financing can also include closing costs and many soft costs in the project, and SBA's and the CDC's fees are generally financed into the debenture rather than paid in cash at closing. Compare the all-in cost over your expected holding period, not only the down payment; see interest rate vs all-in cost.

Rate and term: a long fix against a shorter one

The CDC's debenture is sold to investors after the project is complete, at a fixed rate tied to long-term Treasury yields, and runs for 10, 20 or 25 years, fully amortizing. That means 40% of the project carries a fixed rate for as long as the owner keeps the loan, with no balloon and no reset. The bank's 50% is on the bank's terms, which may be fixed for a period or floating, and SBA sets a minimum term for it so the first lien does not come due long before the debenture.

A conventional commercial mortgage commonly fixes the rate for a shorter period than the amortization, then either resets or comes due as a balloon. The owner who plans to stay in the building for decades takes refinancing risk at each reset: rates may be higher, and the business's results in that particular year decide the terms. That risk is explained in refinancing before a balloon maturity, and the trade between fixed and floating in fixed vs variable rate business loans.

504's strongest feature is not the low down payment. It is a long fixed rate on a large share of the building with no balloon.

The rules that come with 504

504 is a development program, and the benefits come with conditions a conventional lender does not impose:

• Occupancy. The business must occupy at least 51% of an existing building, or 60% of new construction. The rest can be leased to tenants. A conventional mortgage has no occupancy test, so a mostly-investment property belongs there.
• Jobs or public policy. Each project must create or retain jobs in proportion to the CDC's share, or meet one of SBA's community development or public policy goals, such as rural development, expanding manufacturing, or energy reduction. Most established businesses buying their own building meet one of these, but the CDC documents it.
• SBA eligibility. The business must be a for-profit within SBA size standards and not on the ineligible list, and it must meet the credit elsewhere test.
• Guarantees. Every owner of 20% or more personally guarantees. Conventional lenders usually ask for guarantees too, but they are more often limited or negotiated for strong borrowers; see limited vs unlimited guarantees.
• Structure. The building is often held by a separate real estate company leasing to the operating business. 504 allows this through an eligible passive company, with the operating company as co-borrower or guarantor.
• Fixed assets only. 504 funds real estate, construction, improvements and long-life equipment. It does not fund working capital, inventory or goodwill; those need a separate loan.

Since July 2026 the 504 and 7(a) limits are counted separately, so a 504 building loan no longer uses up room a business may want for a 7(a) acquisition or working-capital loan.

Exits: selling, refinancing and prepaying

The long fixed rate has a price. The CDC's debenture carries a prepayment penalty that declines over roughly the first half of its term. An owner who sells the building, or refinances to pull out equity, in the early years pays it. The bank's first lien has its own prepayment terms on top.

Conventional mortgages vary widely. Some have a step-down penalty, some yield maintenance, some none at all after a lockout period; the differences are covered in yield maintenance vs step-down prepayment. With one lender and one set of documents, a sale or refinance is simpler to execute.

That is why the holding period decides most of these comparisons. An owner who expects to stay in the building for many years captures the full value of the fixed rate and rarely meets the prepayment penalty. An owner who might sell the business within a few years, move to a larger building, or do a sale-leaseback to fund growth may pay for flexibility they need. Refinancing an existing building into 504 is also possible under conditions; see SBA 504 refinancing.

Which to choose

Both lenders will test whether the business's cash flow covers all its debt, including the new mortgage. Conventional bank lenders commonly look for debt service coverage of at least 1.25x. The documents are the familiar core set: two to three years of business and personal tax returns, a P&L and balance sheet with a year-to-date P&L, a debt schedule, and a personal financial statement for each 20% owner. The real estate adds the purchase contract or construction budget, an appraisal and an environmental review. Buying a business with its building is covered in acquisitions with real estate, and whether to own the building at all in buy vs lease real estate.

Transparent's lender book includes 278 lenders writing SBA 7(a) and 504, and banks writing conventional real estate term loans among the 1,800+ lenders in the book. The same package can be shown to both, so the owner compares a real 504 structure with a real conventional offer on cash required, fixed-rate share and exit terms.