The lab glut and the tax base

Updated November 2, 2026

What's happening

Somerville bet its commercial tax base on life science buildings, and the tenants never came. New growth revenue, the property tax a city may add above Proposition 2½'s cap because of new construction, peaked at $17.7 million in FY24. It fell to $7.8 million in FY26 and is projected at about $5 million for FY27, a level Finance Director Ed Bean expects to last three years (April 14 Council). That's roughly a 75% drop from the peak (June 4 Council).

The cause can be counted. Chief Assessor Frank Golden reported in April that only five of Somerville's 10 life science buildings are stabilized, with 1.9 million square feet vacant. Commercial and lab property values have now fallen three years running. Six buildings sit at roughly 60% complete and weather-tight. Most owners have filed for abatements, and three have been settled (June 9 Finance). Converting the buildings isn't a way out: Mayor Jake Wilson told the Council that limited windows and specialized air handling make it impractical to retrofit labs for housing or other uses.

The first Somerville lab has now changed hands under distress, though without a fire sale. OSPCD Executive Director Tom Galligani told the Finance Committee on October 20 that a German retail investment fund holding equity in the empty 808 Windsor Place at Boynton Yards, a closed fund that couldn't go back to its investors for more capital, filed for bankruptcy in August, likely after being asked for more money. Developers Leggat McCall Partners and DLJ then handed the deed to the lender, Bank OZK of Arkansas, in lieu of foreclosure. The bank isn't auctioning the building and has hired Leggat McCall to keep managing and leasing it, so "functionally, there's no change," Galligani said. Linkage fees were paid when the building opened, and its arts-space requirements bind any owner. The catch is the tax bill: vacant commercial buildings can petition for abatements, and vacancy drives values down, "not good for Greater Boston." Galligani said most other Somerville labs are backed by pension or insurance money with a longer view, which makes him "more bullish on our ability to weather this storm." The report (26-1429), sponsored by At-large Councilor Will Mbah, was marked work completed (Council Digests summary of the Oct 20 meeting, emailed Oct 21).

Boynton Yards' owners are now asking for zoning relief. A text amendment from Boynton Yards LandCo LLC and Windsor Place Owner LLC goes to a joint Planning Board and Land Use hearing on November 5. The Cambridge Somerville Independent bills it as allowing more housing at Boynton Yards and Windsor Place because lab tenants have dried up (Independent, Nov 1), while At-large Councilor Jonathan Link said in October that it cuts residential and arts space (Zoning amendments in motion in 2026).

The good news keeps landing in Assembly Square. On October 1 Mass General Brigham took 100,000 sq ft of lab space at 74 Middlesex Avenue for its pathology labs, following TransMedics' January lease (Cambridge Somerville Independent, Oct 1; Assembly Square).

The meeting to watch is the November 12 tax classification hearing, when the Council sets FY27 tax rates; Golden asked to appear that night (Somerville Chamber of Commerce newsletter, Oct 22, listing the Oct 22 Council agenda). That's when a shrinking commercial base stops being an assessor's slide and becomes a number on a homeowner's bill.

The story

The regional picture

Somerville isn't alone, and that is the problem: there's no local fix for a regional glut. Cushman & Wakefield found that just over a third of Greater Boston's life sciences space was vacant at the end of the third quarter of 2025. The worst submarket is the "urban ring" of Watertown, Somerville, Allston, Brighton and Fenway, where roughly 55% of 11.7 million sq ft was available. Through three quarters, Cambridge took more than two-thirds of the region's 1.6 million sq ft of leasing (Bisnow, October 9, 2025).

Colliers research director Jeff Myers explained how it happened: "We really, really, really built a lot." Demand collapsed along with venture funding. JLL's Bob Richards said "a sizable portion of the existing lab inventory ... is never going to be leased up as lab space, and it's going to need to be repurposed."

Bisnow named the Somerville buildings:

US2's 196,000 sq ft 10 Prospect Street in Union Square, with no leases announced since it opened in 2024
CV Properties and Cannon Hill's 336,000 sq ft Boynton Gateway, opened in late 2024, also with no leases announced
Leggat McCall's 808 Windsor at Boynton Yards, unleased, while 101 South next door filled up

Golden's own framing in April: Greater Boston has 15 million sq ft of vacant lab space, and the market absorbs about 2 million sq ft a year.

How it hits the budget

The April 14 financial condition report opened the FY27 process with a $4.5 million gap between projected revenue and level-service spending. The FY27 budget book later put the starting shortfall at $5.4 million, "the result of slowing new growth revenue, rising fixed costs, and broader pressures on the commercial real estate market" (FY27 budget book).

Property taxes supply $291,360,382 of the $394 million FY27 revenue budget, or 73.9%. When new growth dries up, the city has no other lever that size. The city closed the gap with fee increases, roughly 5% cuts to non-personnel budgets, $9 million of reserves used to avoid borrowing, a reorganization and 13 layoffs (The FY27 budget). S&P reaffirmed the AAA rating anyway, with reserves at about 36% of revenues.

The shift to residential bills

On November 25, 2025 the Council set FY26 rates. It adopted the minimum residential factor of 82.816, the legal floor, which shifts as much of the burden onto commercial property as the law allows. It also adopted a 35% residential exemption for owner-occupied homes, worth $4,582.40. Rates came out at $18.95 per thousand commercial and $10.99 residential. Golden cited "loss of new growth because of the lack of interest in life science buildings" (Nov 25, 2025 Council). The Council also spent $2.4 million of parking meter receipts to hold the rate down.

The math is simple. The residential factor is already at its legal minimum, so no further shift to commercial property is possible. As commercial values fall and no new commercial value comes on line, the residential share of the levy grows no matter what the Council votes.

The one variable

TransMedics is the swing factor. By the city's account, its lease of the nearly 500,000 sq ft building at 188 Assembly Park Drive takes 25% of Somerville's vacant lab space off the market in one deal (city announcement, January 13). But the city gave an $18 million TIF to land it. The revenue phases in over ten years starting in year three, and operations begin in January 2028. MGB's 100,000 sq ft at 74M is a fifth of that size. Details on Assembly Square.

Everything else in the pipeline depends on something else happening:

50 Webster Avenue is permitted and waiting on the leasing market.
A 19-story spec lab at 120 Middlesex Avenue went to the Planning Board on August 6, where members worried about adding unusable space to a glutted market. It hasn't reappeared.
The UCH-TIF zone for Assembly Square and East Somerville is the administration's attempt to turn the problem into housing. Staff said 59% of the zone's commercial leasable space is vacant or untenanted.

The same numbers cut both ways politically. When the Hamilton Company tried to rezone a Union Square block out of commercial use in April, opponents argued the commercial tax base, 18.8%, is already dangerously low (April 16 Land Use). Hamilton's Jameson Brown has since said of the labs it had planned there, "The market changed." The city's answer, in effect, is that empty commercial land generates nothing.

FY28 is already spoken for

In June, Bean warned of a "perfect storm" for FY28 and flagged that a new elementary school could cost the city $200 million or more (June 9 Finance). FY28 carries three extra pressures: about $446,000 a year in recurring body-camera costs, the six school positions the mayor left out of FY27, and new growth that is still flat. Wilson has said he won't raise taxes ahead of the November 2027 debt-exclusion vote for the new school: "There's no Plan B on that one."

What's next

October 26, 2026: the Sustainability and Infrastructure Committee, chaired by Ward 4 Councilor Jesse Clingan, took up enforcement of the city's law meant to shorten how long properties sit vacant, the storefront end of the glut (outcome not in our sources yet; Independent, Oct 18).
November 3, 2026: Question 8 would end recreational marijuana sales statewide in 2028. Cambridge Day reports that Cambridge and Somerville together took in about $765,000 in local cannabis taxes in fiscal 2025 (ballot).
November 5, 2026: the joint Planning Board–Land Use hearing on the Boynton Yards text amendment (Zoning amendments in motion in 2026).
November 12, 2026: FY27 tax classification hearing and rate vote, with Golden presenting. Expect the same structure as last year, a residential factor plus a residential exemption, and watch the split between commercial and residential values behind it.
Davis Square: the glut shows up in storefronts, not just towers. Asana's lab-focused 7th Spoke redevelopment around 260 Elm Street has been frozen since 2022, and the city has filled the empty Starbucks with a pop-up gallery (Davis Square: the plan and the tower that didn't happen).
Ongoing: abatement settlements on the half-built lab buildings.
January 2028: TransMedics operations begin. They don't rescue FY27 or FY28.