Millennium Tower

Click an image to view larger version.


Height: Architectural 196.6 m / 645 ft
Height: Occupied 180.8 m / 593 ft
Height: To Tip 196.6 m / 645 ft
Floors Above Ground 58
Floors Below Ground 4
# of Elevators 14
Tower GFA 106,933 m² / 1,151,017 ft²
# of Apartments 440
# of Parking Spaces 355


Official Name Millennium Tower
Other Names 301 Mission Street
Structure Type Building
Status Completed
Country United States
City San Francisco
Street Address & Map 301 Mission Street
Postal Code 94105
Building Function residential
Structural Material concrete
Construction Start 2004
Completion 2009
Rankings Click arrows to view the next taller/shorter buildings
Regional Ranking #286 Tallest in North America
City Ranking #6 Tallest in San Francisco

Companies Involved

Developer Millennium Partners
Design Handel Architects LLP
Structural Engineer
Design DeSimone Consulting Engineers
Other Consultant
• Cost AECOM
• Environmental Treadwell & Rollo
Façade Enclos Corp.; Vidaris, Inc.
• Geotechnical Treadwell & Rollo

About Millennium Tower

301 Mission Street, also known as Millennium Tower, is one of the tallest reinforced concrete structure situated in a seismic zone 4 region. The tower’s height posed many challenges and required the creative use of technologies and cutting edge innovations.

In order to meet the owner’s floor height limits, W-sec steel link beams were used as the shearwall core coupling beams. Conventional diagonally reinforced coupling beams would have required significantly more depth. The embedded region of the beam extends 1.2 meters (4ft) into the wall and transfers the beam moment by bearing on the concrete above and below the embedded beam. Conventional ties which are closely spaced in columns and beams can make it nearly impossible to place concrete. A tie system of welded grid reinforcement known as Baugrid was used, which eliminates all hooks and significantly reduces the volume of rebar. All shearwall boundary elements, Special Moment Resisting Frame columns and beams utilize the Baugrid system. The flanges of the shearwall core are reinforced by continuous Baugrids providing resistance for confinement and shear.

To submit more information or donate images for this project, please use our submission portal.