The U.S. office real estate crisis is accelerating: the default rate of office building CMBS has surpassed 11.8%, reaching a record high and exceeding the peak during the 2008 financial crisis.

The U.S. office real estate crisis is accelerating: the default rate of office building CMBS has surpassed 11.8%, reaching a record high and exceeding the peak during the 2008 financial crisis.

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The crisis in the US commercial real estate market, particularly in office buildings, is accelerating at a faster-than-expected pace. The latest data show that as a key "barometer" of market stress, the default rate on office loans in Commercial Mortgage-Backed Securities (CMBS) has reached a historic high.

According to data from asset analysis firm Trepp, in October this year, the default rate for US office CMBS soared to 11.8%. This figure is not only the highest on record but has also surpassed the 10.7% peak during the 2008 global financial crisis.

More concerning is the trend of crisis contagion. The stress is no longer confined to office buildings—CMBS default rates for multifamily residential real estate also jumped sharply by 53 basis points in October, reaching 7.1%, the worst level since 2015.

The speed at which this storm has formed is staggering. In just three years, the office CMBS default rate has soared by 10 percentage points, from 1.8% in October 2022. During this period, ongoing interest rate hikes by the Federal Reserve have tightened credit conditions, and borrowers increasingly recognize that the office properties they own have become obsolete in the new economic reality. When these mortgages are securitized and packaged for sale, the risk is transferred to global institutional investors.

Structural Shifts and the “Refinancing Wall”

The core issue in the current US office building market is not a cyclical, short-term weakness. The remote working model has been entrenched post-pandemic, now accounting for about 28% of full-time work hours—nearly six times pre-pandemic levels. Companies are adapting to this new normal by shrinking office space, pushing nationwide office vacancy rates up to 20%. In certain markets such as downtown San Francisco and Austin, vacancy rates are as high as 36.9% and 27.2%, respectively. Facing such a fundamental drop in demand, a simple refinancing is no longer enough to solve the problem.

The imminent “maturity wall” makes matters worse. In 2025 alone, as much as $957 billion in commercial real estate debt is set to mature, with office loans accounting for around $230 billion. Many loans originally due in 2024 were deferred to 2025, as lenders had hoped for lower interest rates and recovering asset values, but that bet has clearly failed. More debt will mature each year in 2026 and 2027. Under the dual pressure of rising interest rates and falling property valuations, borrowers are unable to refinance to repay old debt, making defaults inevitable.

A series of high-profile project defaults continues to emerge. The landmark Bravern Office Commons in Bellevue, Washington—formerly leased long-term by Microsoft—had its $304 million mortgage classified as in default in October. The property was valued at $605 million in early 2020, but two months ago, Morningstar cut its appraisal to $268 million, a 56% drop in value.

Also on the default list is The Factory project in Long Island City, New York, with a $300 million mortgage. In addition, Federal Center Plaza in Washington, D.C. has suffered a “balloon” default upon maturity. Meanwhile, some loans have been “cured” temporarily through “extend and pretend” strategies, such as the HP Plaza project in the Houston area, where the maturing loan was again extended to maintain normal status for now—but this is merely delaying the problem.

Crisis Spreads: Who Bears the Losses?

The shockwave from the office crisis is spreading to the broader financial system, with regional banks that hold large exposures to commercial real estate loans bearing the brunt.

Of the 158 largest banks in the US, 59 have commercial real estate loan exposures exceeding 300% of their equity. New York Community Bancorp set aside $2.7 billion in losses at the end of 2023 because of this. Once loan extension strategies fail, these loans will have to be marked to market, forcing smaller banks into sharp capital replenishment or earnings erosion.

Another deeper risk lies in municipal finances. The collapse in office asset values directly leads to the evaporation of local government property tax revenues. The city of New Orleans has become the “canary in the coal mine”—with major downtown office loan defaults and surging vacancy rates, the city is expected to face a budget gap as high as $1.4 billion by 2027. The drop in property tax revenue will force cities to cut public services, reducing downtown’s appeal, causing more tenants to leave, triggering more defaults, and leading to a vicious cycle.

According to the structure of CMBS, the ultimate bearer of losses is not the bank that issued the loan. When these mortgages are securitized and packaged for sale, the risk is transferred to global institutional investors. According to media analysis, these investors include bond funds, insurance companies, pension funds, and Real Estate Investment Trusts (REITs), among others. As default rates continue to rise and collateral values fall, these investors will have to directly face mounting losses.

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