What is a CMBS loan?

A CMBS loan is a fixed-rate, usually non-recourse first mortgage on income-producing commercial property that the lender sells into a trust, which issues bonds backed by a pool of such loans. After closing, a master servicer collects payments under a pooling and servicing agreement, and a special servicer takes over if the loan gets into trouble. Terms are usually five or ten years.

How a CMBS loan moves from your closing table to bond investors

1. Origination. A bank or finance company (the originator) underwrites and closes your loan on its own standard documents, built to be sold. Who lends today.
2. Aggregation. The originator holds the loan for weeks or months while it gathers enough loans, often with other originators, to fill a pool.
3. Sale to a trust. The loans are sold to a depositor and then to a trust. The trust is set up as a REMIC, a tax status that lets it pass income to bondholders without paying tax itself (26 U.S.C. 860D).
4. Bonds. The trust issues classes of certificates, from senior AAA-rated classes down to unrated first-loss classes. Losses hit the bottom first. CMBS tranches.
5. Risk retention. Federal rules require the sponsor, or up to two qualifying third-party purchasers, to keep at least 5% of the credit risk (17 CFR 246.4 and 246.7). The buyer of the first-loss piece is the B-piece buyer.
6. Servicing. For the next five or ten years you deal with servicers, not the lender. Master servicer, master vs special servicer.

A real example: the BANK5 2025-5YR14 trust pooled 25 fixed-rate loans totaling $884.4 million from Wells Fargo, Morgan Stanley, JPMorgan Chase and Bank of America, and offered $784.9 million of certificates to the public. The first-loss classes, about 5.03% of fair value, went to TL DF8 RR, LLC as third-party purchaser, an affiliate of both the deal’s special servicer (Torchlight Loan Services) and its controlling class representative (prospectus, cover and p. 328). That pattern, where the first-loss investor also controls the special servicer, is common and matters if your loan ever goes into special servicing.

Why the bond structure sets the loan terms

Almost everything borrowers find rigid about CMBS traces back to the trust:

Loan feature	Why it exists
Fixed rate, set at closing	Bond investors buy fixed coupons; the pool is priced as a whole.
Defeasance or yield maintenance to prepay	Investors bought a stream of payments; early payoff must replace it. Tax rules bar defeasance in the first 2 years after the trust starts (26 CFR 1.860G-2(a)(8)).
Limited ability to modify	A REMIC may hold only qualified mortgages, and a “significant modification” of a performing loan can break that, with exceptions for default or foreseeable default, assumptions and a few others (26 CFR 1.860G-2(b)).
Single-purpose entity borrower	Rating agencies want the property isolated from the sponsor’s other businesses and creditors.
Reserves and cash management	The servicer, not a relationship banker, protects the collateral, so the documents do it mechanically.
Servicer consent for changes	The servicer acts for all bondholders under the pooling and servicing agreement; some decisions also need the controlling class. Servicer consent.

The main features at a glance

Feature	Typical CMBS loan
Property	Stabilized income property: multifamily, retail, office, hotel, industrial, self-storage, mixed use, mobile home parks
Rate	Fixed; current levels on CMBS loan rates
Term	5 or 10 years, with a balloon at maturity. CMBS loan terms
Payments	Mostly interest only. Interest-only CMBS loans
Leverage	Sized to the lowest of loan-to-value, coverage and debt yield. Requirements
Recourse	Non-recourse with carve-outs. Non-recourse CMBS loans
Sale of the property	The buyer can assume the loan with servicer consent. Assumption
Size	No written minimum; small loans are costly. CMBS loan minimum

Your loan becomes public information

Every loan in a publicly registered CMBS trust is reported monthly to the SEC, loan by loan, on Form ABS-EE under Regulation AB (17 CFR 229.1125): balance, rate, payments, occupancy, net operating income and delinquency status. Anyone can read it. That disclosure is what this site’s data is built from: CMBS statistics, rates and lenders, and it is also how a buyer or a competitor can see your loan’s terms.

Who a CMBS loan fits, and who it does not

Good fit: an investor or sponsor with a stabilized property who wants fixed-rate, non-recourse debt, values proceeds over flexibility, and plans to hold to maturity or sell to a buyer who can assume the loan. Property types and markets that banks or agencies avoid often still work in CMBS.

Poor fit:

• Owner-occupied property. A business occupying at least 51% of an existing building belongs in an SBA 504 or 7(a) loan (13 CFR 120.131).
• Small loans, roughly under $1 million to $2 million, where fixed closing costs dominate.
• Construction, lease-up or heavy renovation. That is bridge or construction debt first.
• A likely early sale or refinance. Prepayment is expensive.
• Owners who want a lender to call. After closing you deal with servicers who follow the agreement, not a relationship.

Conduit loans and SASB loans

Most CMBS loans are conduit loans, pooled with dozens of others from several lenders. A very large or unusual property can be financed alone in a single-asset, single-borrower (SASB) deal. Conduit loans and SASB loans cover each.

Weighing it

The case for CMBS is proceeds, a fixed rate and non-recourse terms on property types other lenders turn down. The case against is prepayment rigidity, reserves and lockboxes, and a servicer instead of a banker. The full list is on CMBS loan pros and cons, and the side-by-side comparisons are CMBS vs bank loans, CMBS vs agency loans and CMBS vs life company loans.

When you are ready, how to get a CMBS loan walks through the process, and the CMBS loan calculator estimates what you can borrow. For the market side of securitization, see the CMBS primer.