Since before the pandemic, the value of U.S. office buildings has declined by hundreds of billions of dollars. Vacancy rates have hit 24% nationally — 50% above pre-2020 levels. In San Francisco, it's 36%. Denver, 31%. Dallas, 26%.

Cities run on property tax revenue. When the largest class of commercial real estate in your city loses a third of its value, someone has to make up the difference. That someone is you.

County assessors typically rely on property data that's one to three years old. Most office buildings are still being taxed at 2022 or 2023 valuations — before the vacancy crisis fully materialized. Owners of struggling buildings are paying taxes on values that no longer exist.

When reassessments catch up — and they will — cities face a choice: raise the tax rate to maintain revenue, or cut services. Most will do both.

Boston projects $1.4 billion in lost tax revenue over the next five years as companies downsize and vacate office floors. Washington D.C.'s Office of Tax and Revenue reported significant commercial value declines in its 2026 assessment — wiping out three years of growth overnight. The district projects a $200 million revenue shortfall in fiscal year 2026 alone.

These aren't models. These are budget documents already being used to set next year's residential tax rates.

Here's the pattern nobody's connecting: in cities where office vacancy is highest, residential real estate has held value — or appreciated. Your home went up. The office tower downtown went down. The total assessed value of the city hasn't changed much. Yet.

But when the commercial reassessment hits, the composition shifts. Commercial's share of the total tax base shrinks. Residential's share grows. Your home's value didn't change. Your tax bill did.

San Francisco's commercial property tax revenue has dropped 12% since 2022 while residential values climbed 8%. That gap is being absorbed by the general fund today. Tomorrow, it's absorbed by the residential tax rate.

Cities are promoting office-to-residential conversions as the fix. The math doesn't work at scale. Converting a Class B office building to apartments costs $400-$600 per square foot — often more than building new. The buildings that are candidates for conversion are exactly the ones generating the least tax revenue already.

Only 73 conversion projects completed nationally in 2025. At that pace, it would take 80 years to convert 10% of vacant office space.

Check your city's commercial-to-residential assessed value ratio. If commercial property represents more than 30% of total assessed value, you're exposed. If your city also has an office vacancy rate above 20%, the shift is coming — likely within the next two reassessment cycles.

Cities that have already reassessed (D.C., portions of Cook County) are showing the pattern. Cities that haven't (much of California, Texas) are still on the clock.

The cities least affected: diversified economies where office is a smaller share of total commercial — industrial, logistics, healthcare markets. The cities most exposed: financial centers, government hubs, and tech corridors where office was king.

Property tax is the largest single revenue source for local governments in the United States. When a third of commercial office value evaporates and reassessments lag by years, you get a slow-motion fiscal crisis that arrives all at once — the day your new assessment lands in the mail.

The irony: remote work made your life better and your home more valuable. It also emptied the office tower that was subsidizing your tax rate. The subsidy is ending.

Prediction (Tracked)

Residential property tax rates in the 10 U.S. metros with the highest office vacancy rates will increase by an average of 8-14% by fiscal year 2028, independent of any change in residential property values.

Verification date: July 2028 · Status: OPEN

Domains: Commercial Real Estate × Municipal Finance × Tax Law × Labor Markets × Urban Planning

Confidence: 78 / 100

Sources: Moody's CRE Analytics · Pew Charitable Trusts · D.C. Office of Tax and Revenue · City of Boston Budget Office · CBRE Vacancy Index · NAHB Eye on Housing · Lincoln Institute of Land Policy

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