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101 South Street, Somerville: Boynton Yards Lease Discussions

D
Daniel Amodeo
Oct 6, 2026 • 2 min read
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101 South Street, Somerville: Boynton Yards Lease Discussions
Chapters
Nighttime rendering of a glazed building beside trees and a street.
Historical Boynton Yards proposal rendering, not a current completed-building or lease claim. Rendering Courtesy of Hashim Sarkis Studios

A Cambridge firm considering a Somerville lab

An earlier Boston City Properties report described Flagship Pioneering entering advanced discussions to lease the first laboratory building at Boynton Yards. The proposed premises were at 101 South Street in Somerville; the firm’s Cambridge base did not make the site a Cambridge property.

The account described a nine-story, 289,000-square-foot building on a three-acre site, with construction beginning in July 2019. It had reportedly been built on spec, and the discussions concerned a proposed lease rather than confirmed occupation.

One lease for several startups

The article described Flagship as funding and establishing life-science and sustainability businesses, including firms associated with Moderna, Foghorn Therapeutics and Codiak Biosciences. A lease of the whole building was presented as a way to house different startups and accommodate changing footprints.

Changing research and business footprints were central to that explanation. Compare the actual premises and lease terms when considering shared space, future growth or a changing laboratory requirement.

Boynton Yards and transport context

The account related the building to the then-future Union Square station and Green Line extension, and to Somerville’s interest in attracting life-science activity. These were part of the earlier development context, not a current transport timetable or an official market forecast.

The rendering carried “Rendering Courtesy of Hashim Sarkis Studios.” For a property question now, identify the address, area, research activity, services, purchase or lease and timing; obtain current premises and travel information separately from the earlier discussion.

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Daniel Amodeo

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