- CMBS office lending has tightened sharply since 2023, but capital is still available for well-leased Class A, medical, and suburban office with strong tenancy.
- Leverage has fallen to 55–65% LTV with minimum DSCR of 1.35x–1.45x as lenders price in vacancy and rollover risk.
- Lease-rollover schedule and weighted-average lease term (WALT) are now the single most scrutinized underwriting items.
- Large single-asset deals may use SASB (single-asset, single-borrower) structures instead of conduit pools.
- Class B/C commodity office faces the 2026 maturity wall; many will need bridge or rescue capital rather than conduit refinancing.
CMBS office building loans finance income-producing office assets through securitized commercial mortgages. Of all property types, office has seen the most dramatic repricing since 2023 — hybrid work, elevated vacancy, and a looming maturity wall have made lenders cautious. Yet the headline narrative of "office is dead" obscures a more nuanced reality: capital is still flowing to the right office assets, just at lower leverage and tighter coverage than five years ago.
Class A trophy buildings with credit tenants, medical office buildings (MOBs) anchored by health systems, and well-located suburban office with diversified tenancy continue to attract CMBS and balance-sheet lenders. Commodity Class B and C office in oversupplied downtowns is where distress concentrates.
CMBS Office Loan Terms in 2026
| Parameter | Class A / Medical Office | Class B Suburban |
|---|---|---|
| Max LTV | 60–65% | 55–60% |
| Minimum DSCR | 1.35x–1.40x | 1.40x–1.45x |
| Term | 5–10 years fixed | 5–7 years fixed |
| Amortization | 25–30 years | 25 years |
| Reserves | TI/LC and replacement | Elevated TI/LC reserves |
| Structure | Conduit or SASB | Conduit |
What Lenders Scrutinize: Lease Rollover and WALT
The defining underwriting question for office in 2026 is: when do the leases expire, and will tenants renew? Lenders build a detailed rollover schedule and calculate the weighted-average lease term (WALT). A building with a 7-year WALT and investment-grade tenants underwrites very differently from one with a 2-year WALT and a wave of expirations during the loan term. Expect lenders to size tenant-improvement (TI) and leasing-commission (LC) reserves generously to cover re-leasing costs, and to stress-test cash flow assuming some tenants do not renew.
Conduit vs. SASB for Large Office
Smaller office loans are pooled into traditional conduit CMBS. Large single assets — a $100M+ trophy tower, for example — are often financed through SASB (single-asset, single-borrower) securitizations, where the entire bond is backed by one property. SASB offers more bespoke structuring and is the dominant execution for institutional office, while conduit serves the broader middle market.
The 2026 Office Maturity Wall
A large volume of office loans originated in the low-rate years is maturing into a higher-rate, lower-value environment. Owners of strong assets can refinance, often with a paydown. Owners of weaker commodity office may find that the refinance proceeds fall short of the maturing balance, forcing a fresh equity injection, a bridge loan, or a negotiated workout. We model this dynamic in Refinance Risk 2026: The Maturity Wall.
Frequently Asked Questions
Can you still get a CMBS loan on an office building in 2026?
Yes, but lenders are selective. Well-leased Class A buildings with credit tenants, medical office buildings, and quality suburban office with diversified tenancy can still obtain CMBS financing, typically at 55–65% LTV. Commodity Class B/C office in oversupplied markets is much harder to finance and may require bridge or rescue capital.
What DSCR do CMBS lenders require for office?
CMBS office loans generally require a minimum debt-service coverage ratio of 1.35x to 1.45x in 2026, higher than pre-2023 levels. Lenders also stress-test cash flow against lease rollover, assuming some tenants will not renew during the loan term.
What is the difference between conduit and SASB office loans?
Conduit CMBS pools many smaller loans across different properties and borrowers into one bond. SASB (single-asset, single-borrower) securitizes a single large property as its own bond. SASB is used for institutional trophy assets needing bespoke structuring; conduit serves the middle market.
Why is lease rollover so important for office loans?
Lease rollover determines whether a building's income survives the loan term. Lenders calculate the weighted-average lease term (WALT) and model what happens if expiring tenants leave. Heavy rollover during the loan term increases re-leasing risk and cost, leading to lower leverage and larger TI/LC reserves.
First Realty Capital sources CMBS, bridge, and balance-sheet capital for office assets across the Southeast. Contact us for a candid assessment of your office property's financing options.
Related reading: Refinance Risk & the Maturity Wall | How Lenders Underwrite CRE | What Is a Conduit Loan?
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