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As part of Skanska’s commitment to delivering the latest in sustainable design and technology, 121 Seaport is designed to be environmentally responsible and extremely energy efficiency. The sustainable design minimizes energy costs, reduces overall environmental impact, protects employee health and enhances workplace productivity.


  • Targeting LEED Platinum Certification
  • Chilled beam mechanical system reduces building energy usage and costs
  • Efficient curtain wall system with low Solar Heat Gain Coefficient (SHGC) glass
  • Rainwater reuse system with 40,000-gallon tank capacity reduces water use by approximately 30%
  • Elevated 10’ ceiling height increases natural daylight penetration towards core
  • Ample insulation in roofs, with vegetation on terrace areas
  • Total energy recovery system utilizes building exhaust air to pre-treat ventilation air
  • Reduced solar exposure resulting from elliptical form decreases energy usage by 15%

Office Space

  • Tower rentable area ranges from 24,470 SF to 27,140 SF per floor
  • Podium level space up to 31,000 SF
  • Compact and efficient concrete core
  • Core to perimeter wall dimensions from 48’ to 86’
  • 30’ perimeter column spacing for flexible tenant layout

Amenities & Retail

  • Private, tenant-only fitness center
  • Rooftop terrace
  • Two stories of world-class retail by WS Development


  • Approximately 270 parking spaces
  • Electric vehicle charging stations
  • 2 garage elevators with VIP express capabilities
  • Secure, covered parking for 270 bicycles within the garage


  • Aerodynamic shape reduces wind loads and yields increased structural efficiency
  • Soft curvature of building results in sweeping views
  • Structural steel building with composite trusses and a concrete core
  • Curtain wall includes floor-to-ceiling high-performance vision glass

Harbor Way

  • Expansive 70’ wide pedestrian retail promenade
  • 15,000 square feet of tree-lined open space at the building’s base
  • World-class retail by WS Development

Floor Heights

  • 20’ floor-to-floor at first floor
  • 17’ and 13’8” floor-to-floor on podium floors
  • 12’-8” floor-to-floor on tower floors
  • 10’ finished ceiling height with 1’ sill height

Seaport Square Green

  • Connects to Fan Pier Park, creating a continuous public space that reaches Boston Harbor
  • Connects to the Harborwalk Grand civic lawn to support active recreation and public events
  • Newly-built food pavilion


  • Three-story lobby with ultra-clear vision glass facing Seaport Square Green, Fan Pier Park, and Boston Harbor
  • Entrance opens to Harbor Way and Seaport Boulevard

Electrical System

  • 7.0 watts per usable square foot for tenant use
  • 277/480V 3-phase, 4-wire electric service
  • 4,000 amp busway for connection by tenant
  • Mission critical building systems raised to upper level floors to improve building resiliency


  • 24 hours, 7 days per week staffed system
  • Card access at main building entry, service doors and turnstiles

HVAC System

  • Hot water risers to serve perimeter baseboard heating elements
  • Hot and chilled water risers to serve chilled beam conditioning system
  • Return/exhaust air risers balancing the supply of air flow
  • Condenser water riser available for supplemental cooling (10 tons per floor)


  • Two risers feeding all floors providing flexibility
  • Cell phone enhancement system

Vertical Transportation

  • Seven high-speed elevators plus one service elevator
  • Destination Dispatch elevator technology for reduced travel times
  • State-of-the-art gearless traction passenger elevators
  • Stairways designed to accommodate use as inter-floor connectors
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