The transformation of Somerville’s Assembly Row from industrial waterfront to life sciences campus mirrors the broader evolution of the Greater Boston biotech ecosystem. New laboratory and GMP cleanroom facilities at Assembly Row attract early-stage and clinical-stage biotech companies that require the quality infrastructure of Cambridge without the Cambridge price point. The proximity to Kendall Square — accessible via the MBTA Green Line extension — makes Somerville a natural overflow for the world’s most productive biotech ecosystem. Philips’ North American headquarters is a further sign of the corridor’s pull: the company’s 2,000-employee campus at 250 North Street, part of the Cambridge Crossing development, sits directly on the Cambridge-Somerville line — evidence that major health technology employers, not just early-stage biotech, are anchoring here.

That momentum is concentrated a few blocks away at 100 Chestnut Street, a 200,000-square-foot life sciences building in Somerville’s Brickbottom district that reached 90% occupancy within two years of opening. Ultragenyx Pharmaceutical (NASDAQ: RARE) relocated its gene therapy research operation there from Kendall Square in 2024, opening a 42,730-square-foot facility with a ribbon-cutting attended by Massachusetts Governor Maura Healey — work that complements the company’s gene therapy manufacturing plant in nearby Bedford. Generate:Biomedicines, the NASDAQ-listed protein design company (GENB), is headquartered in the same corridor at 101 South Street. And Hatch.Bio Labs operates a 50,000-square-foot, LEED Platinum-certified biotech incubator in the same building, housing more than 60 resident life sciences companies since 2017 — exactly the kind of new-facility, ground-up cleanroom commissioning environment CleanTech Systems is built to support.

Somerville’s profile is rising further with TransMedics Group’s planned move to Somerville in 2027. TransMedics — whose Organ Care System keeps donor organs viable outside the body, fundamentally changing transplant surgery outcomes — is exactly the kind of high-consequence medical manufacturing that defines Somerville’s next chapter. Somerville’s growth story extends beyond biotech, too: Form Energy, the iron-air battery and grid-storage manufacturer, is headquartered on Dane Street with roughly 800 employees, adding an advanced-manufacturing dimension to the district. Somerville’s cleanrooms are largely new construction, built to modern GMP specifications from the ground up — exactly the environment where a partner experienced in new-facility commissioning matters most from day one.