Assembly Row – Block 9 Advances 318 Homes in Somerville

Federal Realty Investment Trust, DiMella Shaffer, and H+O Structural Engineering are advancing Block 9 at Assembly Row: an eight-story, mixed-use development at 375 Harold Cohen Way in Somerville, MA. The project will deliver 318 new homes, 12,900 square feet of retail and daycare space, and a parking garage, continuing Federal Realty’s transformation of the Mystic River waterfront into a connected, transit-oriented neighborhood.

Design and Structure

Fronting Harold Cohen Way and Foley Street, Block 9 brings new retail and daycare uses to the ground level, adding vitality to the pedestrian realm. Two landscaped courtyards draw daylight and air deep into the plan, enhancing livability for residents.

H+O is providing full structural design services, working closely with DiMella Shaffer to coordinate column grids, spans, and bearing walls with residential layouts. The podium integrates parking, building services, and open space.

"It was $500,000 saved on a $24M project. That is real money, right?"
- Dave Traggorth, Causeway Development

Third-Party Cost Review - Risk Free

Design A New Project

A Next Step in Somerville’s Urban Transformation

Following previous phases (Montaje, Miscela, and AVA Somerville), Block 9 occupies one of the final parcels in the Assembly Row master plan. Its 20% affordable housing component supports Somerville’s goal for equitable, transit-oriented growth while reflecting the city’s evolving urban identity.

Looking Ahead

Federal Realty, DiMella Shaffer, and H+O Structural Engineering are shaping Assembly Row into the benchmark for sustainable, high-density development.

In multifamily and mixed-use projects, controlling budget and risk is non-negotiable. Our data-backed structural design gives project teams the clarity and confidence to protect the pro forma and deliver with precision. Ready to elevate your next project? H+O delivers the measurable savings others miss.