Tishman Speyer is stepping in to run and lease a roughly 490,000-square-foot life sciences campus in Boston’s South End, tightening its grip on one of the city’s hottest lab corridors. The two-building complex straddles Harrison Avenue and Washington Street just south of the Ink Block and a cluster of new lab projects, putting one of the country’s largest landlord-operators in charge of day-to-day operations and leasing at the site.
According to the Boston Business Journal, Tishman will handle property management and leasing for 321 Harrison Avenue and 1000 Washington Street, a package the report sizes at about 490,000 square feet. The story, reported by Hannah Baratham-Green, was published June 16.
Campus background and building mix
321 Harrison was built out as an eight-story lab and office addition on top of a three-story garage, with architecture firm SMMA listing the new construction at roughly 232,000 square feet and designed with lab-ready floorplates. City planning records for the 1000 Washington / 321 Harrison Planned Development Area show the older 1000 Washington tower has been the focus of an office-to-lab conversion plan and broader site gross floor area discussions as the owner works to modernize the campus.
Ownership and recent history
The two buildings have already been through a repositioning cycle and a sale in recent years. Funds managed by Blackstone acquired the pair after an earlier ownership and repositioning effort, and BioMed Realty has been involved in operating and retrofitting the assets. The prior sale was covered by REBusinessOnline, while local coverage has followed BioMed’s subsequent conversion filings and Boston Planning & Development Agency reviews.
Why the management change matters
Landlords across the country are trying to read an uneven life sciences market. CBRE Research pegged lab and R&D vacancy across top U.S. markets at about 23.2% in the first quarter of 2026, even as hiring and venture funding show some resilience. In that kind of climate, bringing in a big operator with an existing Boston footprint can reset leasing strategy, capital planning and tenant outreach, all of which are crucial when lab buildouts are expensive and complex. Tishman Speyer’s Boston listings already show a sizable portfolio of life science and other assets in the market.
What’s next for tenants and the neighborhood
Planning documents from the Boston Planning & Development Agency indicate the site has undergone project-level review for conversion work and mechanical upgrades. How quickly the campus fills up will depend on permit timing and the pace of tenant buildouts, so neighbors may see more construction signage than lab coats in the short term. Boston Planning & Development Agency records remain the clearest public trail for tracking approvals, and Tishman Speyer’s leasing team is expected to start working the phones with prospective lab tenants in the weeks ahead.
