May 28, 2026 · By Mariusz Kurylo · Commercial Real Estate Collapse

Multifamily Is Now the Most Delinquent CMBS Sector as the Apartment Boom Reverses

For years, multifamily was the darling of commercial real estate — the "safe" sector when offices were emptying and retail was collapsing. That assumption is now being tested under the weight of too much new supply, falling rents, rising operating costs, and a refinancing market that has grown hostile.

According to Law360's Real Estate Authority coverage, multifamily is now the most delinquent sector among the $3.2 billion in CMBS debt maturing in 2026 — surpassing even the troubled office sector that has dominated CRE distress headlines for the past three years.

The Supply Glut That Broke the Math

The apartment boom of 2021–2024 produced one of the largest waves of new multifamily construction in U.S. history. Developers, flush with cheap capital and rising rents, broke ground on hundreds of thousands of units. Many projects were financed with floating-rate bridge loans at 3–4%, underwritten on the assumption that rents would continue climbing and that permanent financing could be secured at similar rates.

Both assumptions proved wrong.

National median asking rent across the 50 largest U.S. metro areas fell to $1,673 per month in April 2026, down $29 year-over-year, marking the 33rd consecutive month of annual rent declines. U.S. rents have been falling for nearly three years. The number of multifamily units under construction stood at an average of 684,000 (seasonally-adjusted annual rate) in Q1 2026 — down from a peak of 971,000 in Q1 2024, but still 11.4% above pre-pandemic averages. Those completions are arriving into a market where demand has softened significantly.

The Refinancing Wall

Projects financed in 2021–2022 on two-to-three year bridge terms are now due. The refinancing math is catastrophic:

  • Property net operating income has declined because rents fell and occupancy softened
  • Operating costs (insurance, property taxes, labor) have risen significantly
  • Appraisal values reflect lower NOI, creating a gap between the debt and current value
  • New financing is available only at 7–8%+ (bridge) or 6%+ (fixed-rate agency/CMBS)

The Mortgage Bankers Association reported that multifamily lending volumes plunged 30% on a quarterly basis in Q1 2026. The NAHB's Multifamily Production Index registered just 44 — anything below 50 indicates more respondents describe conditions as poor than good.

Insurance and Operating Cost Explosion

In Florida, Texas, California, and other major multifamily markets, property insurance premiums have risen 40–80% since 2022, driven by climate-related losses and carrier withdrawals from certain markets. Property taxes — based on assessments that lag the market — are also catching up to pandemic-era appreciation, hitting landlords with higher bills at precisely the moment when rental income is declining.

The combination of rising expenses and falling revenues is compressing net operating income across vast swaths of the apartment market.

Who Is Most at Risk

Class B/C apartments competing directly with the flood of new Class A supply face the steepest vacancy increases. Renters who can afford it are trading up to new units at lower market rents; older properties lose their tenants and cannot raise rents to compensate.

Sun Belt markets — Phoenix, Austin, Dallas, Nashville, Charlotte — that saw the most aggressive development are seeing the sharpest occupancy and rent declines. These are the markets where bridge loan defaults are most likely to cluster.

Highly leveraged deals closed in 2021–2022 at aggressive cap rate compressions (4–4.5%) now look impossible to sustain at current NOI levels and a 6%+ discount rate environment.

The Private Credit Signal

The broader distress is visible in private credit markets. Fitch Ratings reported in May 2026 that the U.S. private credit default rate hit a record 6.0% in April — and private credit is a major funding source for exactly the kind of value-add multifamily deals that were most aggressively underwritten in 2021–2022. The Financial Stability Board has warned that global banks hold "hundreds of billions of dollars" in direct and indirect exposure to private credit funds.

The Irony of the "Safe Haven"

There is a deep irony in multifamily's current predicament. Conventional wisdom held that apartments were the most recession-resistant CRE sector — people always need housing. That thesis was never quite right, and the post-pandemic cycle has exposed why.

Apartments are not immune to supply cycles. They are not immune to financing stress. And they are not immune to the mathematics of a sector that attracted too much capital too quickly, at prices that made sense only at interest rates that no longer exist.

For CRE investors, lenders, and regulators, the message from 2026 is clear: the next wave of distress will not be limited to empty office towers. It will include apartment buildings that looked, from the outside, like solid assets.

Sources: Law360 Real Estate Authority, Mortgage Bankers Association, Realtor.com, Scotsman Guide, NAHB, Fitch Ratings