Boston, MA

One Congress Street at Bulfinch Crossing

Market Sectors
Carr Properties | HYM Investment Group | National Real Estate Advisors
Pelli Clarke & Partners | CBT Architects

One Congress Street is a 43-story Class A office tower that is the anchor of the Bulfinch Crossing renewal. The 600-foot tower has 1,000,000 SF of office space. The façade is completed with a curved and gently tapered design and glass-and-steel curtain wall, contemporary in spirit. A one-acre private landscaped terrace located on the 11th-floor for employees is included, along with a fitness center and upscale food and beverage offerings. The three-story grand lobby and the additional 10,800 SF of ground-floor retail space associated with the building are integrated into a dynamic experience, connecting it to the streetscape of the mixed-use destination.

Engineering Insights

  • One Congress is the second building of the multi-phased Bulfinch Crossing redevelopment. At 43 stories and 528-feet, it is also one of the tallest office towers in Boston since the early 1980s. One of the most architecturally significant features is the curtainwall “swoop” that spans from the ground floor to the apex of two screenwall sails at the roof.
  • The “swoop” curtainwall façade was held proud of the main floorplate and supported by a cantilevered structure unique to each floor. At the lower levels, where the swoop angle was flatter, the façade was supported with a secondary steel girt system until the curtainwall could support itself vertically. Significant effort was spent on the coordination and analysis to ensure that the secondary support system behaved as anticipated for the primary floor steel design. The backup system, including façade connections, accounted for approximately 15,000 man-hours of fabrication.
  • At the top, the swoop transitions to sloping screenwall sails on either side of the building. With a maximum height of 85-feet above the roof level, the screenwall accounts for approximately one-third of the building’s total wind load. The screenwall is supported by a combination of vertical trusses and in-place bracing.

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