What was approved
Boston's planning authority approved four additional office-to-residential conversion projects on May 18, 2026, together adding 434 apartments. The approvals bring the city's conversion pipeline to nearly 1,800 apartments.
The projects are part of the office-to-residential conversion programme run under Mayor Michelle Wu, which offers tax relief to owners willing to convert older downtown office buildings to housing. The programme, launched in 2023 and extended twice since, offers a 29-year property-tax abatement covering 75 percent of the converted building's residential assessment, as-of-right zoning for the change of use downtown, and an expedited Article 80 permitting process, according to the city planning agency's own programme materials.
As of an April 2026 account, the initiative had approved 29 buildings citywide for conversion, a pipeline of 1,730 units at that point, with one project — 15 apartments at 281 Franklin Street — already completed and six more under construction. The city's stated target is 2,500 converted units by December 2026.
Caveat: only one detailed account of this specific May 18 approval was available, and it did not list the individual addresses or the affordability breakdown for the four projects. Those details are not established here.
The scale question
Nearly 1,800 apartments is a real number and a small one. Boston's downtown office stock runs to tens of millions of square feet, and a conversion pipeline of this size will not resolve either the office vacancy problem or the housing shortage on its own.
That is not a criticism of the programme so much as a description of what conversion can do. Office buildings convert to housing only when their floorplates, window lines and mechanical systems permit it. Deep-floorplate towers built for open-plan tenancy generally do not, because interior space too far from a window cannot be made into a legal bedroom. The convertible subset of any downtown is a minority of it.
Why these deals need public help
Conversion economics are unforgiving. The buyer must acquire the building at a price that reflects residential rather than office value, then fund a gut renovation that touches plumbing risers, egress, façade and elevator counts. When office values fall far enough, acquisition prices can support that work; until they do, the arithmetic fails.
Tax abatement closes part of the remaining gap by reducing the carrying cost during the years when the building produces no income. That is why cities pursuing conversion at any scale have generally had to offer it.
What to watch
Analysis: approvals are not completions. The meaningful measure of Boston's programme will be how many of the nearly 1,800 approved units are occupied in three years, and at what rents. Conversion projects are unusually exposed to construction-cost surprises because the existing structure is only fully understood once demolition begins.
The second measure is whether the approvals continue as office values stabilise. Conversion is partly a function of distress; if office pricing recovers, the acquisition prices that make these projects work may no longer be available.