Money & Finance › Commercial real estate lending
CMBS: conduit loans pooled into commercial mortgage bonds
Since the early 1990s (RTC)· Asset or instrument
Fact, law or dataA rule, statute, definition or measured number.
Fixed-rate property loans made to be pooled in a trust that sells bonds, from AAA-rated down to an unrated first-loss slice.
See it on the Money & Finance map →How it works
A conduit lender, often an investment bank, makes 5- or 10-year fixed-rate loans, usually $2 million and up, at up to about 65–75% of value, often interest-only. The borrower must be a single-purpose LLC and signs a non-recourse loan, a bad-boy carve-out guaranty and cash-management (lockbox) terms. Fifty to a hundred or so loans go into a REMIC trust that sells bonds in tranches. Afterward a master servicer collects payments; if trouble hits, a special servicer takes over.
Why it matters
Pros: non-recourse, fixed-rate money at solid leverage. Cons: rigid terms, costly defeasance or yield maintenance, and in trouble a special servicer answering to bondholders, not a banker, decides.
Facts, rules and data
Each public deal files a prospectus and monthly reports with the SEC, so loan-level data are public; MBA put CMBS and similar holdings near $650 billion at end-2025.
Debates and risks
Whether special servicers' fees for workouts and foreclosures push outcomes away from what is best for bondholders or borrowers is debated.
Inside this (4)
Connections (15)
▸CMBS: conduit loans pooled into commercial mortgage bonds is a type of Commercial real estate loans: how income property is financedFact, law or data
The connection
A conduit loan is a CRE loan written to be sold rather than held. It follows rating-agency standards: a single-purpose borrower, fixed rate, non-recourse with carve-outs, lockbox triggers and defeasance. CMBS and similar securities held about $650 billion, roughly 13% of commercial and multifamily mortgage debt, at end-2025.
When and why
US conduit lending since the 1990s; issuance peaked near $230 billion in 2007, collapsed to a few billion in 2009, then recovered.
How we know
MBA debt-outstanding data, Commercial Mortgage Alert and CRE Finance Council issuance tallies, and SEC filings for each public deal.
Debates and risks
Whether CMBS will regain its pre-2008 share, against banks, debt funds and investor caution on office, is uncertain.
▸CMBS: conduit loans pooled into commercial mortgage bonds is the commercial cousin of Mortgage-backed securities (MBS)Fact, law or data
The connection
Both pool mortgages into bonds. Most residential MBS are guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae, so investors mainly bear prepayment risk. Private CMBS carry no guarantee, so investors bear the credit risk, sliced into tranches, while lockouts and defeasance protect them from early payoff.
When and why
Residential pass-throughs began with Ginnie Mae in 1970; CMBS took off in the 1990s after the RTC showed commercial loans could be pooled.
How we know
Deal prospectuses, SIFMA issuance statistics, and the guarantee terms published by Fannie Mae, Freddie Mac and Ginnie Mae.
Debates and risks
Agency apartment bonds, such as Freddie Mac's K-deals, blur the line: senior slices are guaranteed, junior ones are not.
▸CMBS: conduit loans pooled into commercial mortgage bonds are sliced into tranches rated by Credit rating agencies: Moody's, S&P and FitchFact, law or data
The connection
A CMBS deal's bonds are cut into layers. Rating agencies model the loans and decide how much lower-ranked debt must sit beneath each layer for it to earn AAA, AA and so on. Most of the pool is rated AAA; the thin bottom slices are rated below investment grade or not at all.
When and why
S&P, Moody's, Fitch, KBRA and Morningstar DBRS rate US CMBS; issuers choose which agencies to hire for each deal.
How we know
In January 2015 S&P settled SEC and state charges over misleading CMBS rating methods, paying tens of millions and accepting a one-year ban on rating conduit deals.
Debates and risks
'Ratings shopping', hiring the agency with the kindest view, is a long-running concern; how much it still inflates CMBS ratings is debated.
▸Investment banks: underwriting, deals and trading originate and package CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
A bank's conduit desk makes loans and holds them in a warehouse, hedging rate risk, until it has enough. It pools them with other lenders' loans in a trust, hires rating agencies and sells the bonds, earning the spread between loan rates and bond yields. Since 2016 it must keep 5% of the risk, or a qualifying B-piece buyer must.
When and why
Big banks such as Goldman Sachs, Morgan Stanley, JPMorgan, Wells Fargo and Citi, plus non-bank lenders, originate most conduit loans.
How we know
Each deal's prospectus names its loan sellers and underwriters; Dodd–Frank's risk-retention rule took effect for CMBS in December 2016.
Debates and risks
Whether 5% risk retention improved loan quality, or mainly raised costs and shrank the market, is still argued.
▸CMBS: conduit loans pooled into commercial mortgage bonds grew out of the cleanup after Savings and loan crisis (1980s–90s)Fact, law or data
The connection
After hundreds of thrifts failed, the government's Resolution Trust Corporation held billions in commercial mortgages no one would buy one by one. It pooled them into bonds with senior and junior layers and sold them in the early 1990s, building the investor base, rating methods and servicing models that private conduit lenders then copied.
When and why
The RTC, created by Congress in 1989, resolved 747 failed thrifts holding about $394 billion of assets before closing at the end of 1995.
How we know
The FDIC's official history of the RTC and records of its commercial mortgage securitizations, among the first large CMBS deals.
Debates and risks
How much credit the RTC deserves, versus smaller private commercial mortgage deals in the 1980s, is a matter of emphasis among historians and practitioners.
▸CMBS: conduit loans pooled into commercial mortgage bonds loans are held in a REMIC: the tax-free trust that holds a CMBS loan poolFact, law or data
The connection
When a conduit lender pools 50 to 100 loans, it sells them to a trust that elects REMIC tax status. The trust issues the bonds, passes loan payments through untaxed, and must keep the pool static, which limits what servicers can change later.
When and why
Nearly every US conduit CMBS deal since the early 1990s; REMIC status itself came from the Tax Reform Act of 1986.
How we know
Each CMBS prospectus states the REMIC election and includes a tax counsel opinion; the trusts file IRS Form 1066 each year.
Debates and risks
CRE CLOs, used for floating-rate bridge loans, often avoid REMIC limits so managers can modify loans; whether that yields better workouts is debated.
▸Prepayment penalties: step-down, yield maintenance, defeasance are strictest in CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
CMBS bondholders bought a fixed stream of payments, and REMIC tax rules limit how the trust can change loans. So conduit loans usually bar prepayment for about two years after securitization, then require defeasance or yield maintenance until a short open window before maturity.
When and why
Standard in US conduit loans since the 1990s; the REMIC rules date from the Tax Reform Act of 1986.
How we know
CMBS loan agreements, Treasury REMIC regulations allowing defeasance only after two years, and defeasance cost data.
Debates and risks
Defeasance fees vary widely among consultants and servicers, and borrowers often cannot see how the servicer's charges are set.
▸Loan covenants, cash sweeps and lockboxes are standard in CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
Because a CMBS trust cannot easily renegotiate, lenders build controls in from day one: tax and insurance escrows, reserves for leasing costs, and a lockbox, often springing, that sweeps cash on a DSCR or tenant trigger. Rating agencies expect these terms before rating the bonds.
When and why
In nearly all US conduit and single-borrower CMBS loans since the 1990s, written into each loan agreement and cash management agreement.
How we know
CMBS offering documents, whose loan-level annexes list each loan's lockbox and cash management type, and published rating-agency criteria.
Debates and risks
Whether strict cash controls lower CMBS losses enough to justify their cost to owners has not been well measured.
▸'Bad-boy' carve-outs: when a non-recourse loan springs recourse are written into nearly every CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
A CMBS trust cannot judge each owner, so it relies on the property plus carve-outs that punish bad conduct. Rating agencies expect them, and conduit loans include them with a carve-out guaranty from a creditworthy principal. Servicers enforce them when an owner diverts rent or files for bankruptcy.
When and why
Standard in US conduit loans since the 1990s, alongside single-purpose-entity covenants.
How we know
CMBS loan documents, rating-agency criteria, and court cases such as Cherryland (Michigan, 2011).
Debates and risks
Wording varies loan to loan; whether a given act, such as missing a tax payment or allowing a lien, triggers full recourse is often litigated.
▸CMBS master and special servicers collect payments and work out loans for CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
A CMBS trust has no staff. Its pooling and servicing agreement hires a master servicer to collect payments and advance missed ones to bondholders, and a special servicer to handle defaults. Both act for all bondholders under a 'servicing standard': maximize recovery on a present-value basis.
When and why
In every CMBS deal; major servicers include KeyBank, PNC's Midland, LNR, Rialto and CWCapital.
How we know
Pooling and servicing agreements filed with the SEC, and monthly remittance and servicer reports.
Debates and risks
Whether servicers' fees and their recovery of advances line up with what bondholders as a whole want is a long-running debate.
▸B-piece buyers: the first-loss investors in a CMBS deal buy the riskiest bonds in CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
In a CMBS deal, losses run bottom-up. B-piece buyers purchase the bottom 5–7% of bonds, rated BB, B or unrated, at high yields. Their willingness to take first losses lets the higher tranches earn AAA ratings and sell at low yields to insurers and pension funds.
When and why
In US conduit CMBS since the 1990s; buyers include KKR, Rialto, LNR (Starwood) and Eightfold.
How we know
Offering documents name the B-piece buyer and show tranche sizes and ratings; Trepp tracks their holdings.
Debates and risks
Some analysts doubt that B-piece buyers' loan reviews stay as tough in boom years as in busts.
▸Jamison Properties' CMBS office defaults in Los Angeles (2024–26) show the non-recourse model at work in CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
Jamison held many buildings in single-asset entities financed with 10-year CMBS loans, typically non-recourse. When those loans matured in 2024–25 with occupancy and values down, the lenders' main remedy was each building, not Jamison's wider portfolio. Special servicers such as LNR took over and negotiated building by building.
When and why
Koreatown and downtown Los Angeles; loans made around 2014 that matured in 2024–25.
How we know
CMBS servicer commentary via Morningstar Credit and trade press (The Real Deal, Commercial Observer, Bisnow); full loan terms sit in deal documents.
Debates and risks
Exactly which carve-outs or guarantees Jamison's principals signed is not public, so the limits of their personal exposure are unknown.
▸CMBS: conduit loans pooled into commercial mortgage bonds are the classic non-recourse side of Recourse vs. non-recourse loans: is the owner personally liable?Fact, law or data
The connection
Bondholders buy a pool of many loans and cannot assess each owner's finances, so CMBS lends on the property alone: a single-purpose LLC, cash controls and carve-outs. That makes conduit loans the classic 'no personal guarantee' option, as long as owners avoid the bad-boy triggers.
When and why
The US conduit market since the 1990s; widely used by large office owners, including Jamison Properties in Los Angeles.
How we know
CMBS loan documents and loss reports showing bondholders, not owners, absorbing losses after foreclosures.
Debates and risks
Some argue non-recourse CMBS made it easier to walk away from office buildings after 2023; others say losses reflect market shifts, not owner choices.
▸Retail real estate: struggling malls, resilient strip centers saw mall loans sour inside CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
Many malls were financed with large non-recourse CMBS loans. As anchors closed and sales fell, income dropped below debt payments, and owners often handed the keys to special servicers rather than add equity. Retail CMBS delinquency peaked at about 18% in June 2020 (Trepp), and many mall loans were resolved at heavy losses to bondholders.
When and why
Regional malls nationwide, 2016–2025; mall owners CBL, Washington Prime and Pennsylvania REIT all filed for bankruptcy in 2020–21.
How we know
Trepp delinquency data, monthly CMBS servicer reports, and the bankruptcy filings of mall REITs.
Debates and risks
How much mall debt loss still sits in CMBS pools, and how low appraisals on dying malls should go, is debated.
▸Hotels: real estate that reprices every night (RevPAR) is often financed through CMBS: conduit loans pooled into commercial mortgage bondsFact, law or data
The connection
Hotel income swings, so banks lend cautiously and many owners use CMBS, including single-asset deals for big hotels; bond buyers accept the risk for higher interest. In trouble, non-recourse terms let owners walk away: Park Hotels stopped paying a $725 million CMBS loan on two San Francisco hotels in 2023.
When and why
US-wide; the Park loan covered the Hilton San Francisco Union Square and Parc 55, with the default announced in June 2023.
How we know
CMBS deal filings, Trepp property-type data, and Park Hotels & Resorts' June 2023 announcement and SEC filings.
Debates and risks
Whether lenders price hotel risk correctly, given that hotel delinquency jumps faster than other property types in downturns, is debated.