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Buying the building your business operates out of is one of the few moves that changes the long-term economics of a small company. Rent is a permanent expense that goes up. A mortgage on owner-occupied real estate converts cash into equity every month and gives you a depreciable asset on the balance sheet. The reason more owners do not buy is that the down payment on a conventional commercial mortgage is brutal: 25% down on a $2M property is a $500K check most operators cannot write without selling something else.
This guide walks through how a commercial real estate loan business purchase actually gets structured when you use the SBA 504 program. We will cover the three-part loan structure, which property types qualify, and the buy versus lease math with real numbers.
How the SBA 504 structure actually works
SBA 504 is not one loan. It is three pieces that close at the same time. The bank funds 50% as a conventional first mortgage, typically fixed for 5 to 10 years and then floating, amortized over 25 years. The CDC (Certified Development Company) funds 40% as a debenture backed by an SBA guarantee, currently pricing around 6% and fully fixed for 25 years with full amortization. The owner contributes 10% as equity.
The 25-year fully fixed CDC piece is what makes 504 special. In conventional commercial real estate, rate resets every 5 to 10 years are the norm, which exposes the buyer to whatever the market looks like at the next reset. The 504 debenture eliminates that exposure on 40% of your loan for a quarter century. That is a real risk management tool, not just a marketing point.
The 10% equity requirement has edge cases. New construction bumps owner equity to 15%. Special-purpose properties like hotels, gas stations, and bowling alleys also require 15%. Combine new construction and special-purpose and you are at 20%. For an existing, general-use building bought by an established business, the 10% number holds. For the full eligibility frame, see our guide on how to qualify for an SBA loan.
The occupancy rule is the gating test. Your business must occupy at least 51% of the building for existing structures, and 60% for new construction with a path to 80% within ten years. The remainder can be leased to third parties, and that rental income is yours. Many operators intentionally buy slightly larger buildings than they currently need and lease 30% to 40% to tenants, which offsets a significant chunk of the monthly debt service.
Which properties qualify and which do not
Eligible property categories for SBA 504 are broader than most buyers assume. Office, retail strip centers, industrial flex, warehouse and distribution, mixed-use with ground-floor commercial, restaurants, hotels and motels with an owner-operator on site, and specialty properties all qualify. Specialty uses we see regularly include auto repair, daycare, medical and dental offices, veterinary clinics, self-storage, and funeral homes. Our convenience store and gas station funding guide covers the specialty subset.
What does not qualify is property held primarily for investment. If you are buying a building to rent the whole thing to unrelated tenants, that is conventional investment real estate. The 51% owner-occupancy rule is the bright line. Most 504 deals are structured with the operating company leasing from a related real estate holding company that owns the building, which is the standard tax-efficient setup and is fully eligible.
Loan size limits matter. The CDC debenture maxes out at $5 million for most uses, and $5.5 million for manufacturing or energy-efficient projects. With the 40% CDC piece capped, the total project size 504 can fund is roughly $12.5 million. For projects above that ceiling, conventional commercial becomes the path. Our SBA 504 page walks through the project-size math.
Buy versus lease: the math that actually matters
Buy versus lease is not a monthly payment comparison. It is a multi-year cash and equity analysis that has to include four things most spreadsheets leave out: principal paydown, depreciation tax shield, control over future occupancy costs, and the option value of leasing excess space.
Take a realistic example. A $2M building, your business occupies 60%, you lease 40% to a tenant. You put 10% down ($200K) and finance $1.8M through SBA 504 at a 6.5% blended rate over 25 years. Monthly principal and interest is roughly $12,150. Equivalent lease at market rates runs $14,000 to $16,000 monthly. Commercial real estate is depreciated straight-line over 39 years. A $2M building with 80% allocated to structure generates roughly $41,000 per year in depreciation. At a 21% federal rate, that is an $8,600 annual cash tax shield. Cost segregation studies, which accelerate depreciation on fixtures, flooring, and HVAC into 5, 7, and 15-year buckets, can multiply that number three to four times in year one.
Over five years, the buy side looks roughly like this. $200K down plus 60 months of payments at $12,150 equals $929K total out, of which about $200K is principal paydown back into equity. Net occupancy cost before tax shield is around $731K. Lease side: $14,000 base rent for 60 months with 3% annual escalators equals $892K, plus CAM and pass-throughs adds another $190K, total $1,082K. The buy case wins by roughly $350K over five years, and you own a $2M-plus asset at the end of it. If the 40% leased portion brings in $5,000 per month, that is another $300K of cash inflow that widens the gap further.
Two cautions on the buy side. SBA 504 is full recourse with a personal guarantee. Conventional commercial at $2M and above is often non-recourse, which is a real difference in downside risk if the business fails. And real estate is illiquid. Exiting a building takes 6 to 18 months versus signing a lease termination. Both are real costs to weigh before you apply.
How TurboFunding Helps
TurboFunding structures owner-occupied commercial real estate purchases from $10K to $5M for businesses with 550+ FICO, $10K+ monthly revenue, and 6+ months in business. For SBA 504 deals, we match you with one of our CDC partners and handle the bank first mortgage in parallel, which is how 504 closings get to the finish line in 60 to 90 days rather than the 120+ days solo-shopping takes. Need to close fast and refinance into 504 after? Our bridge loan program funds acquisition while the 504 structure is arranged. For projects above the ceiling or buyers who fail the owner-occupancy test, we place conventional commercial through our SBA loan and bank relationships. Soft credit pull, 3-minute application. Find out More.
Frequently Asked Questions
Q. Can I use SBA 504 to buy a building and rent most of it out?
A. No. The 51% owner-occupancy rule (60% for new construction) is non-negotiable. If your business will occupy less than 51% of the rentable square footage, the deal is conventional commercial real estate, not SBA 504. The good news is the inverse: you can occupy 51% and lease the other 49% at full market rates, and that rental income is yours.
Q. What credit score and time in business do I need for SBA 504?
A. Practical minimums are 680+ FICO and 2+ years in business for the SBA 504 program specifically, though some CDCs will go lower with strong financials and equity. If you are below those thresholds, our commercial mortgage loans guide covers conventional options that are less score-sensitive but require more down payment.
Q. How long does a 504 closing actually take?
A. 60 to 90 days is realistic with a clean file and a responsive borrower. The bank first mortgage and the CDC debenture close in parallel, but the CDC piece has to be submitted to SBA for final approval, which adds 2 to 4 weeks. If you are under a purchase contract with a tight closing date, bridge financing can hold the property while 504 finishes. See our piece on bridge financing versus hard money for the comparison.
Q. Can I refinance an existing commercial mortgage into SBA 504?
A. Yes, the 504 Refinance Program allows refinancing of qualifying owner-occupied commercial real estate debt, and in some cases you can take out additional cash for eligible business expenses. The original debt must be at least 6 months old and substantially used for 504-eligible purposes. This is one of the most underused parts of the program.
Q. What happens to my 504 loan if I sell the building?
A. Both the bank first mortgage and the CDC debenture get paid off at sale. The CDC piece has a declining prepayment penalty for the first 10 years of the 25-year term, which can be meaningful in the first 5 years. Plan to hold the property for at least 5 to 7 years to make the math work, which is the same hold period most operators use for any owner-occupied commercial purchase.
Buying the building your business runs out of is one of the highest-leverage long-term decisions a small business owner makes. SBA 504 closes the down payment gap that keeps most operators stuck in lease territory, and the 25-year fixed CDC piece removes the rate reset risk that makes conventional commercial nerve-wracking. For the right operator in the right property, it is a multi-hundred-thousand-dollar swing over five years and a real equity position at the end of it. If you are looking at a building and want to know whether the numbers work, we can run the structure with you. Apply in 3 minutes with a soft credit pull. Find out More.