Image courtesy of Berkeley Investments

A venture-backed clean manufacturing company has leased half of the available space at the redevelopment of Sasaki’s former headquarters in Watertown.

Via Separations of Watertown will occupy 50,699 square feet at 64 Pleasant St.

Founded by MIT researchers, Via Separations received $38 million in series B funding led by NGP ETP in 2021. The company manufactures advanced filtration systems used in the pulp and paper sectors.

Boston-based Berkeley Investments is redeveloping the former architects’ home into tech and life science space.

Berkeley Investments bought the Sasaki property in 2021 for $23 million and received approval for the 105,000-square-foot redevelopment. The base buildout converted the 160-year-old former Chase Mills into lab and R&D space and added a fitness wing, conference center, roof deck and outdoor patio.

Cushman & Wakefield’s David Thomann and Connor Barnes represented Via Separations in the lease negotiations. Newmark’s Dave Townsend, Juliette Reiter, Catie Tilton and Dan Krysiak represented Berkeley Investments.

Sasaki recently opened its new downtown Boston headquarters at 110 Chauncy St.