Boston Office Slump Triggers Tax Push

Office Market Slide Pressures Tax System

Boston’s commercial property sector continues to weaken, says Bloomberg. New data shows values are on track to fall another 6% in fiscal 2026. Last year, values dropped 5% as office towers and life science buildings sat vacant. Investor interest remained limited.

Meanwhile, residential property values are climbing. Since state law restricts how Boston adjusts tax rates between sectors, the burden is shifting. As a result, homeowners are now shouldering the largest share of the tax load in over 40 years.

Mayor Michelle Wu warned that, without intervention, the average single-family home will see a 13% property tax hike next year. Over the past three years, the average bill has already jumped 34%.

Mayor Wu Pushes for Tax Reform

Fresh off her reelection, Wu is urging lawmakers to pass a proposal that raises commercial property tax limits. Her goal is to rebalance the system and protect residents from larger increases.

Last year, the proposal passed the City Council and the Massachusetts House. However, it stalled in the state Senate due to concerns about harming the commercial sector. Despite this setback, Wu said at a press briefing, “This is something we can fix.”

Now, she faces a time crunch. Tax bills are scheduled to go out in just a few weeks. Wu is asking state lawmakers to act quickly and spare homeowners another financial shock.

In the meantime, she’s directing city departments to curb spending growth. She also plans to form a task force to find new revenue sources in 2026. In addition, Wu supports Governor Maura Healey’s plan to give local governments more power to raise taxes.

Business Groups Push Back

However, many business leaders oppose the plan. They argue that it unfairly targets a sector already under stress. As of Q3 2025, nearly 27% of downtown Boston office space was available for lease. Life sciences buildings, once booming, show similar vacancy levels.

The biotech industry has seen sharp cuts in both jobs and investment. In Cambridge, where institutions like Harvard and MIT are located, commercial values are expected to fall 12.5% in the upcoming fiscal year. At the same time, property owners across Boston are turning to tax appeals in record numbers, reflecting mounting pressure from ongoing vacancies and declining asset values.

Tamara Small, CEO of NAIOP Massachusetts, urged the city to rethink its approach. “We continue to urge the city to review the many anti-growth policies that have blocked new development,” she said. “We also need to diversify revenue sources.”

Structural Risk in Boston’s Tax System

Boston’s fiscal model is uniquely vulnerable. About one-third of its tax revenue comes from commercial property taxes. That’s a much higher share than in most large US cities.

To address this imbalance, Wu is also calling for changes to Proposition 2.5. This Massachusetts law limits annual growth in a city’s tax levy, which restricts Boston’s flexibility in adjusting tax rates.

Importantly, the latest property assessments do not include newly opened office buildings. These properties are exempt from Prop 2.5’s cap on yearly tax increases.

The city expects final approval of its valuation figures from the Massachusetts Department of Revenue within days.

Why It Matters

Boston’s deepening office slump is no longer just a real estate problem—it’s a fiscal one. Without tax reform, homeowners will face higher costs. Meanwhile, commercial property owners warn of further economic damage if rates rise.

Mayor Wu’s proposed tax shift underscores the growing need for flexible revenue strategies. As cities across the US face similar pressures, Boston’s experience could shape broader policy debates in the years ahead.