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May 31, 2018

Private Building
Over $100 million

Photo provided by PCL Construction Services
Conditions beneath the Tower 12 site were a mystery, so team members did research to prepare for surprises.

Tower 12

Location: Seattle

General contractor: PCL Construction Services

Owner/developer: Continental Properties

Owner's representative: Continental Properties

Primary designer: Weber Thompson

Architect of record: MG2

Tower 12 is a 34-story, 314-unit apartment building in Seattle' Belltown neighborhood. The building structure is cast-in-place, post-tensioned concrete, while the exterior is a combination of curtain wall at the podium level and a window wall system for the remainder of the tower.

The apartment units are complemented by nine parking levels (five of which are underground), three elevators, ground-floor retail space and three levels of common residential amenities, including a conference room, theater, fitness room, game room, gourmet kitchen, yoga studio, lounge, and outdoor podium and rooftop terraces. The patio's fireplace is one of the largest, most eye-catching features, standing at 12 feet wide with a 24-inch flame.

The 492,000-square-foot tower was completed on time and on budget and with an exemplary safety record. The Weber Thompson-designed project achieved LEED silver. PCL also provided preconstruction services.

As the team began construction, the underground conditions of the existing site remained a mystery. The site contained several items that were identified in geotechnical reports, but to what extent was unknown.

The team knew it would encounter buried heating oil tanks, foundations, debris from previous building demo and more. Rather than exclude all unknown conditions, PCL, the civil engineer, geotechnical engineer and PCL's shoring subcontractor completed some research and found historical drawings of the property, as well as documentation of some foundations from the shoring drawings of the neighboring project.

The owner authorized PCL to perform strategic exploratory potholing to confirm assumptions made from these discovered documents.

(Editor's note: This article has been updated to reflect that Weber Thompson is the design architect and MG2 is the architect of record.)

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