If your business is buying, building, or renovating the property it operates from, the SBA 504 loan is often the cheapest long-term way to do it: roughly 10% down, a fixed-rate government-backed second mortgage, and terms up to 25 years. But the 504 is also the most structurally complicated loan most owners will ever close — three parties, two mortgages, occupancy tests, and an interim-financing step that surprises almost everyone.
Here's exactly how the 504 works for commercial real estate, with a complete project example and the honest trade-offs.
The 504 capital stack: who funds what
A 504 isn't one loan — it's a project financed by three sources, in a specific lien order:
| Layer | Typical share | Lien position | Rate & term |
|---|---|---|---|
| Bank / third-party lender | ~50% of project cost | First mortgage | Negotiated with the bank; fixed or variable |
| CDC / SBA debenture | Generally up to 40% | Second mortgage | Fixed, pegged above the 10-year Treasury; 10, 20, or 25 years |
| Borrower Down Payment (Equity Injection) | At least 10% | — | Cash, land equity, or other eligible sources |
The regulation (13 CFR Part 120, Subpart H) caps the SBA piece at generally 40% of total project cost, and no more than 50% of eligible project costs may come from federal sources — which is why the bank's first mortgage anchors the stack.
Two things make this structure unusually borrower-friendly:
- Low effective Loan-to-Value (LTV) requirements for you. Conventional commercial mortgages often want 20-30% down; the standard 504 asks for 10%.
- A long fixed rate on the second mortgage. The debenture rate is locked at funding for the full 10-, 20-, or 25-year term — no balloon, no reset.
The occupancy tests: 51% existing, 60% new construction
The 504 exists to help operating businesses own their real estate — not to fund landlords. Passive and speculative real estate businesses are ineligible (SBA). Per SBA eligibility requirements (documented on SBA Form 2234C):
- Buying an existing building: your operating company (or affiliated operating companies) must occupy at least 51% of the rentable space. You can lease out the remaining 49% — a real advantage if the building is bigger than you currently need.
- New construction: you must occupy 60% immediately, lease no more than 20% long-term, occupy more than 60% within 3 years, and plan to occupy at least 80% within 10 years.
Measure occupancy by rentable square footage, and get the numbers pinned down before you go under contract. A 48%-occupied purchase is a dead deal no matter how strong your financials are.
Basic business eligibility also applies: for-profit, operating in the U.S., tangible net worth under $20 million, and average net income under $6.5 million after federal taxes for the prior two years (SBA).
What the 504 can pay for (it's more than the building)
Eligible project costs under 13 CFR 120.882 and the SBA 504 page include:
- Land and existing buildings — purchase price plus closing costs
- Ground-up construction of new facilities
- Renovation and modernization of existing buildings
- Site improvements — grading, utilities, streets, parking lots, landscaping
- Soft costs — title insurance, architectural and engineering fees, appraisals, environmental studies, and interest on interim financing
- A contingency reserve for construction cost overruns, up to 10% of construction cost
That last group matters: because soft costs and contingency roll into "total project cost," your 10% injection is calculated on the all-in number — and so is the 90% you're financing. Long-term equipment can also ride along in a 504 project, though many owners handle machinery separately with equipment financing to keep the real estate deal clean.
Worked example: a $2.0 million building purchase with renovation
A 6-year-old HVAC contractor buys a $1,650,000 warehouse/office building it will fully occupy, with $250,000 of renovations.
| Project cost | Amount |
|---|---|
| Building purchase | $1,650,000 |
| Renovation | $250,000 |
| Contingency (10% of construction) | $25,000 |
| Soft costs (appraisal, environmental, title, fees, interim interest) | $75,000 |
| Total project cost | $2,000,000 |
The standard stack:
| Funding source | Share | Amount |
|---|---|---|
| Bank first mortgage | 50% | $1,000,000 |
| CDC/SBA debenture (second lien) | 40% | $800,000 |
| Borrower equity injection | 10% | $200,000 |
Compare that to a conventional deal at 25% down: $500,000 of cash instead of $200,000. The $300,000 difference stays in the business as working capital — often the entire argument for the 504.
Note the fee treatment: fees totaling roughly 3% of the debenture (about $24,000 here) can be financed into the loan rather than paid at closing (SBA). The bank charges its own fees on the first mortgage separately. And because it's two loans, your true cost is a blended rate across both mortgages — model the payments on each piece, then combine.
▦Estimate your sba 7(a) & 504 loans paymentsRun the numbers in the sba 7(a) & 504 loans estimator →▸If the business were under two years old, or the property were special-purpose (say, a self-storage facility), the injection would likely rise to 15% — $300,000 on this project — with the CDC share shrinking correspondingly.
Process, appraisal, environmental, and the interim-financing step
A realistic sequence for a 504 real estate deal:
- Prequalify with a bank and a CDC. 504 loans are available only through SBA-certified CDCs working alongside a senior lender. Both underwrite the deal — expect scrutiny of your Debt Service Coverage Ratio (DSCR), tax returns, and interim financials.
- Appraisal and environmental review. A commercial appraisal supporting the project cost is required, and environmental investigation (from a records search up to a Phase I Environmental Site Assessment, depending on property type and risk) follows SOP 50 10 8. Gas stations, dry cleaners, and industrial sites should expect deeper review — budget time and money for it.
- Approval and closing on the bank loan plus interim financing. Here's the step that surprises borrowers: the SBA debenture is funded through periodic bond sales after the project is complete. So the bank (usually the same one holding the first mortgage) provides an interim loan covering the CDC's 40% during purchase/construction. The interim loan cannot cover your equity injection — your 10% goes in first (13 CFR 120.801).
- Project completion and debenture funding. Once the project is done, the debenture funds on the SBA's scheduled sale dates, pays off the interim loan, and your permanent fixed rate locks at that point — not at approval.
Timing varies with the deal: a straightforward purchase moves considerably faster than ground-up construction, and the debenture funding calendar adds a lag at the end. Ask your CDC for the current 504 debenture funding schedule so you can map real dates. Get your paperwork tight early — our business loan documents checklist covers the core package.
504 vs. 7(a) vs. conventional for real estate
| Factor | SBA 504 | SBA 7(a) | Conventional commercial mortgage |
|---|---|---|---|
| Typical down payment | 10% standard (more for new/special-purpose) | Varies by lender and deal | Often 20-30% |
| Rate structure | Fixed debenture (40%) + negotiated bank loan (50%) | Usually variable, negotiated | Fixed or variable; balloons common |
| Best for | Real estate and major fixed assets | Mixed uses (real estate + working capital + goodwill) | Strong borrowers wanting speed and fewer rules |
| Occupancy rules | 51% existing / 60% new construction | Owner-occupancy required for real estate | Lender-specific; investor deals possible |
| Complexity | Highest (three parties, interim loan) | Moderate | Lowest |
One 2026 development worth knowing: the SBA announced a rule allowing eligible borrowers to combine 7(a) and 504 borrowing up to $10 million total (up to $5 million each), decoupling 7(a) balances from the 504 cumulative limit (SBA, May 18, 2026). For a business that needs both a building and substantial working capital, that materially expands what's possible — confirm implementation details with your lender.
For the broader landscape — including deals a 504 can't touch, like investor-owned property — see our commercial real estate financing guide.
Where a marketplace fits
The CDC side of a 504 is standardized; the bank side is not. First-mortgage rate, fixed period, fees, prepayment terms, and appetite for your industry vary widely from bank to bank — and that 50% slice is the biggest piece of your stack. That's where shopping pays.
EQ Funding is not a lender and doesn't approve loans. One application reaches a network of lenders — including SBA-experienced banks — that compete for your deal, so you can compare first-mortgage terms side by side instead of taking the first offer. Start with SBA loans or explore commercial real estate financing options more broadly.