CMBS Loans Explained

Commercial Mortgage-Backed Securities (CMBS) are pools of 50–150 commercial mortgages securitized into tranched investor bonds. A CMBS loan is non-recourse (property is the only collateral), carries a 5–10 year balloon, and imposes strict covenants—it's a lender's tool, not a borrower's friend.

Key takeaways

• CMBS loans are non-recourse; if the property fails, the lender takes it and the borrower walks away with no further liability.
• Term is typically 5–10 years with a balloon payment of the full remaining balance at maturity.
• Pricing is SOFR + 200–300 bp (7–8% all-in in 2024), reflecting the duration and securitization premium.
• Covenants are tight: yield maintenance prepayment penalties, lockbox accounts, capital expenditure escrows, special servicing triggers.
• CMBS works well for stabilized, credit-tenant properties; it breaks down for value-add plays or early refinances.

Why CMBS exists: the securitization model

In the 1990s and 2000s, investment banks realized they could bundle commercial mortgages and sell them to capital markets. Rather than holding $100 million in mortgages on the bank's balance sheet, a bank could originate $100 million, bundle it into a CMBS deal, and sell it to pension funds, insurance companies, and hedge funds. The bank earned origination and servicing fees; the investors got steady cash flows; the borrower got access to capital (assuming they passed underwriting).

CMBS exploded from 2003–2007, collapsed in 2008–2011 (property values crashed; servicers were overwhelmed with defaults), revived modestly 2012–2019, then nearly vanished in 2020 (COVID uncertainty). By 2022, CMBS returned as cap rates normalized. In 2023–2024, $50–$70 billion in CMBS issuances per year became normal again.

The securitization machine requires standardization. A CMBS pool might have:

• 80 mortgages, $5M–$30M each, across 40 properties in 20 states
• Mix of asset classes: 40% multifamily, 25% office, 20% retail, 15% hotel
• Geographic diversification (no single property > 3% of pool; no single state > 15%)
• Minimal single-tenant concentration (no single tenant > 10% of pool rents)
• Credit quality metrics (DSCR ≥1.2x, occupancy > 90%)

This standardization means CMBS loans are conservative and prescriptive. They work for trophy assets with rock-solid tenants; they struggle for quirky or repositioning plays.

The non-recourse covenant: Your liability stops at the property

This is the seductive feature of CMBS: non-recourse. You take a $30 million CMBS loan on a $50 million office building. The building's value collapses to $25 million. At maturity, you can hand the keys back to the lender and walk away. The lender cannot pursue you personally for the $5 million shortfall.

Contrast that with agency debt (Fannie/Freddie) or life company loans, which are full recourse. You're on the hook for every dollar if the property underperforms.

Non-recourse is valuable—a $5 million put option on a $30 million loan. But the lender prices that in: non-recourse loans carry 100–150 bp premium over recourse debt. A comparable agency loan might be 5.5%; a non-recourse CMBS loan is 6.5–7.5%.

Subtlety: Many CMBS loans have "defeasance" clauses. If property value drops or refinance becomes impossible, you can substitute collateral (cash, Treasuries, AAA-rated securities) to maintain the lender's position. Defeasance is practical non-recourse in normal markets but becomes a trap in crashes when collateral haircuts are huge.

Term, amortization, and the balloon

A CMBS loan is typically:

• 5–7 year term (most common) or 10 year term (for trophy assets)
• Interest-only or minimal amortization (1–2% per year)
• Full balloon at maturity (typically 75–85% of original balance)

A $30 million CMBS loan with 5-year term and interest-only payments:

• Year 1–5: $30M × 6.5% = $1.95M annual interest ($162.5k/month)
• Year 5: Balloon payment of $30M due

This is a refinance risk. If the property still pencils at a 4.8% cap rate in year 5, you can refi into an agency loan (or another CMBS if rates are favorable). If cap rates have compressed to 4.2% or expanded to 5.5%, your refinance options and pricing change dramatically.

Some CMBS deals have partial amortization (2–3% per year), bringing the balloon to 65–70% of the original amount. This reduces refinance risk but increases carry cost. Borrowers trade off lower monthly payments (interest-only, lower amortization) against balloon risk.

Pricing: SOFR + 200–300 bp

CMBS pricing moved dramatically post-Fed action. In 2021, CMBS loans priced at SOFR + 100–150 bp (~3–3.5% all-in). By 2023, amid higher rates and credit tightening, CMBS pricing jumped to SOFR + 225–300 bp (~7–8% all-in). This 300+ bp move reflected:

• Fed funds at 5.5% (vs. near-zero in 2021)
• Broader credit spreads widening post-SVB
• Slower securitization demand
• Valuation uncertainty (cap rates still adjusting)

A property that was financeable at 3% in 2021 became unfianceable at 8% in 2023, purely from debt markets, not property fundamentals.

CMBS pricing varies by seniority. Loans within the pool are rated by moody's, S&P, or Fitch. A "AAA" tranche (first-loss-absorbing) prices at SOFR + 80–120 bp; a "BBB-" tranche at SOFR + 600+ bp. Borrowers don't directly own tranches—they own the whole loan. But the blended pricing for a $100M pool of loans reflects the weighted-average of tranche pricing.

The prepayment penalty maze

CMBS loans have strict prepayment rules. You cannot exit early without penalty. Three common structures:

1. Yield Maintenance: If you prepay, you pay the lender a penalty equal to the difference between the loan's coupon (6.5%) and the current market rate for a comparable-term security, times the remaining balance. If rates dropped to 5%, the penalty might be 100 bp × $30M × remaining years / 10 = ~$3M. This is expensive and discourages refinancing into lower rates.

2. Defeasance: Instead of a cash penalty, you substitute collateral (U.S. Treasuries, AAA-rated securities) to replicate the lender's cash flows. This is cheaper than yield maintenance in falling-rate markets but cumbersome.

3. Lockout Period: For the first 2–4 years, prepayment is completely prohibited. After lockout, yield maintenance applies. This forces the borrower to hold the loan for the lockout period.

These penalties exist because CMBS lenders are selling the loans to investors who expect 6.5% yield for 7 years. If you refinance at year 3 into a 5% agency loan, the investor loses the expected return. The penalty compensates the investor.

The implication: Do not take a CMBS loan if you think you'll need to refinance early. Do not take a CMBS loan into a hot market where cap rates are compressing (you'll regret the yield maintenance penalty as rate-positive arbitrage disappears). CMBS works for "hold-to-maturity" sponsors or sponsors confident in execution.

Covenants and special servicing

CMBS loans have extensive covenants designed to protect securitization tranches:

• Debt Service Coverage Ratio (DSCR): Minimum 1.20x (NOI / debt service). If occupancy drops and DSCR falls below 1.20x, the loan may move to special servicing.
• Loan-to-Value (LTV): Maximum 60–65% at origination. If property value drops 20%, LTV might breach.
• Occupancy: Minimum 85–95%. If occupancy falls below threshold, escrow requirements or additional covenants kick in.
• Capital Expenditure: Holdback of 5–10% of loan amount, released annually as the borrower completes capex and proves it.
• Lockbox: Rents are collected into a lockbox account; lender has priority claim if servicer calls a default. Not all CMBS loans have lockbox, but competitive loans often do.
• Tenant Diversification: No single tenant > 20% of rents (this changes between loan types).

If you breach a covenant, the loan moves to "special servicing." The special servicer is a third party (often a boutique firm like Berkadia or a bank division) that works with the borrower to cure the default. This process can be:

• Straightforward (you occupy additional space, DSCR rebounds)
• Negotiated (lender agrees to a temporary waiver)
• Adversarial (special servicer forces a sale or deed-in-lieu)

A breach doesn't automatically mean foreclosure, but it signals distress to the investor pool. Servicers have a legal obligation to maximize recovery for all tranches, which can mean forcing a sale even if the borrower could cure with more time.

CMBS vs. agency debt: A comparison

Aspect	CMBS	Agency (Fannie/Freddie)
Recourse	Non-recourse	Full recourse
Term	5–10 years, balloon	30 years, full amort.
LTV	50–65%	60–65%
Rate	SOFR + 225–300 bp (7–8%)	Treasury + 100–150 bp (5.5–6.5%)
Prepayment	Yield maintenance, high penalty	Open or soft step-down
Covenants	Tight (lockbox, capex escrow)	Moderate (DSCR, occupancy)
Sponsor credit	Moderate (good underwriting)	Strong (proven operator)
Underwriting	45–60 days	60–90 days
Best for	Stabilized, trophy, long hold	Growth, refinance, leverage

A savvy sponsor might take CMBS for a stabilized, no-plans-to-touch property; agency debt for a value-add repositioning that will be refi'd in 3 years.

When CMBS breaks: The refinance cliff

The worst-case CMBS scenario: You borrowed $30 million at 6.5% on a 5-year term with a 7-year balloon (no amortization). Year 5 arrives; you need to refi. But cap rates have jumped to 5.5% (property is now worth $25 million, not $31 million). You cannot refi into an agency loan without putting up $5 million in equity. You cannot refi back into CMBS because CMBS lenders want cap rates > 4.5%. You're stuck with a balloon payment and no options.

This happened to many CRE sponsors in 2023. Properties that were financed at 3–4% rates in 2020–2021 needed to refi at 7–8% in 2023. CMBS became unavailable; agency loans required significant equity. Bridge lenders wouldn't touch the deals. Defaults and distressed sales followed.

The lesson: If you borrow via CMBS, stress-test the refi scenario. What cap rate do you need in year 5 to refi without putting up capital? What margin of safety does that give you?

The CMBS flow chart

Related concepts

• CRE financing overview and debt sources
• Agency multifamily loans as an alternative
• Life company loans for stabilized assets

Next

CMBS is tight and unforgiving. Agency multifamily loans, by contrast, are the borrower-friendly option for apartment buildings. They offer 30-year amortization, full recourse (but stronger sponsors want that), and refinance flexibility. The next article unpacks the Fannie Mae and Freddie Mac multifamily programs—how they work, who qualifies, and when they are the right choice over bridge or CMBS.