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ALS Lab Locks In Watertown Deal As Arsenal Yards Lands New Research Heavyweight

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Published on April 23, 2026
ALS Lab Locks In Watertown Deal As Arsenal Yards Lands New Research HeavyweightSource: Google Street View

Watertown's Arsenal Yards just added another lab coat to its closet, with the ALS Therapy Development Institute signing on for a hefty chunk of space in the mixed-use complex. The nonprofit is taking roughly 33,000 square feet in the historic 200 Arsenal Yards building, a move that deepens the campus's lineup of research tenants while it continues to juggle retail, apartments, and labs along the Charles River.

According to the Boston Business Journal, ALS Therapy Development Institute has agreed to a 33,310-square-foot lease at 200 Arsenal Yards Boulevard in Watertown. The report did not include financial terms for the deal or specify when the institute expects to move in.

Who the tenant is

ALS Therapy Development Institute is a nonprofit research outfit focused on discovering and developing treatments for amyotrophic lateral sclerosis, better known as ALS. The organization says it runs the world's largest drug-discovery lab dedicated exclusively to ALS research and notes that it has long been based in Watertown. According to the ALS Therapy Development Institute, its current public address is 480 Arsenal Street in Watertown.

The space and the building

The property at 200 Arsenal Yards Boulevard is marketed as an approximately 108,000-square-foot life-science conversion, with high ceilings, skylights, and lab-ready infrastructure aimed squarely at biotech and research tenants. Arsenal Yards leasing materials call out roughly 100,000 square feet of lab space and direct access to the development's retail and transit-friendly amenities, according to the campus marketing pages.

Regulatory filings show that SQZ Biotechnologies previously listed 200 Arsenal Yards Boulevard as its principal office and as a prior location of space within the building, as detailed in an SEC filing.

What it means for the market

The lease adds one more data point to a very active stretch in Watertown's Arsenal corridor, where landlords and investors have been reshuffling properties and boosting lab capacity. Boylston Properties and Arsenal Yards leasing information indicate that multiple biotech tenants are already on the campus, and local reporting has flagged a nearby medical-office sale and other portfolio maneuvers that highlight steady churn in the neighborhood's real estate scene. See coverage of a nearby medical office sale for one recent example of those shifts.

Key details such as whether ALS Therapy Development Institute will consolidate operations into the new space or exactly when it will move in have not been made public. The Boston Business Journal was first to report the lease signing, and property records along with future statements from the institute or the landlord are expected to clarify the final timing and footprint as the deal is fully wrapped up.

Boston-Real Estate & Development