Award Winning – Montaje

Somerville, MA

The Assembly Row complex, developed by Federal Realty Investment Trust, features several segments that will add up to more than 600,000 square feet of retail, 1,800 residential units, and 2.8 million square feet of office space. Now underway are segments called Block 5A, the 13-story Alloy Residences & Autograph Collection Hotel, and Block 6, a 20-story, 273-unit apartment building along with a six-story, 174-unit wooden structure and a seven-story, 650-car precast concrete parking structure.

“Hollowcore was specified for the structural flooring systems for a number of reasons for the Block 5A project, several related to the harsh winter conditions that would be prevalent during construction,” explains Jake McManus, project superintendent and Brian R. Knox, senior project manager, both of PROCON Inc., the design-builder on the Block 5A project.

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Projects details

  • 2021 Design AwardsBuilding Award: Best Hybrid Parking Structure

  • PrecastersJ.P. Carrara and Sons Inc., Middlebury, VT

  • Owner(Assembly Row Blocks 5A & 6) Federal Realty Investment Trust, Rockville, MD

  • Architect(Assembly Row Block 5A) PROCON Inc., Manchester, NH

  • Architect(Assembly Row Block 6) ADD Inc. (now Stantec), Boston, MA

  • Engineer(Assembly Row Block 5A) PROCON Inc., Manchester, NH

  • Engineer(Assembly Row Block 6) ODEH Engineers, North Providence, RI

  • Contractor(Assembly Row Block 6) Callahan Construction, Bridgewater, MA


  • Sq. Footage: (Assembly Row Block 5A) 206,000SF 8" hollowcore plank (JP Carrara)

  • Sq. Footage: (Assembly Row Block 6) 300,000SF, 8" hollowcore plank (JP Carrara)

  • Sq. Footage: Architectural Precast Panels on Block 5A and 6 (BPDL)

  • Sq. Footage: 7 Story all precast parking (Unistress Corp)

  • Levels/Floors: (Assembly Row Block 5A) 13-story, 122 high-end condos & 160 hotel guestrooms

  • Levels/Floors: (Assembly Row Block 6) 20-story, 273-unit apartments

  • Levels/Floors: 7-story, 650-car precast concrete parking structure