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September 20, 2010

505 1st Avenue South

Work is finished on the 505 1st Avenue South office building in Pioneer Square.

The 292,000-square-foot project, originally intended to house Starbucks' offices, was redesigned during construction to be high-end leasable space.

The lobby was redesigned to accommodate multiple tenants rather than one. It has a 60-foot video wall.

A planned feature stairway through the office levels was deleted to add new floor area, and skylights were redesigned.

Some connecting elements between 505 First and the adjoining 83 King Building were deleted, but the integration of fire sprinklers, fire alarms, emergency power and the building control system were kept in the new design.

Excavation for the 400-car garage extended 42 feet below grade, but the water table is less than 7 feet below grade. After studying options, the team chose a cutter soil mix subterranean wall, which it said is a new approach in Seattle. This was the least costly, and allowed for more precise drilling and vibration control that helped protect the century-old sewers and structures around the site.

The wall, a mixture of cement, bentonite and soil plus soldier piles, formed nearly watertight shoring during construction.

Two historic facades from the Annex wing of 83 King were incorporated into the building. One facade along First Avenue was preserved in place with steel bracing.

The facade along Railroad Way was taken apart and reconstructed, with permission from the Pioneer Square Preservation Board.

The project is in line to win LEED silver.

Property manager: Martin Smith, Seattle

Owner: Starbucks, Seattle

Owner representative: The Seneca Real Estate Group, Seattle

General contractor: Lease Crutcher Lewis, Seattle

Architect: NBBJ, Seattle

Structural and civil engineer: Coughlin Porter Lundeen, Seattle

Geotech engineer: Hart Crowser, Seattle

Shoring design-builder: Condon-Johnson, Tukwila

Mechanical and plumbing design-builder: Holaday-Parks, Seattle

Electrical and lighting design-builder: Nelson Electric, Seattle


Do you have renderings or photos of recent projects? Share them with DJC readers. Send high-resolution images and information to maude.scott@djc.com.

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