November 12, 2015

Big pour for 41-story tower on Boren Ave.

Photo from Mortenson Construction [enlarge]
The foundation is for a 393-unit residential tower on the same half block as the Tilt49 office complex.

Rendering by ZGF Architects [enlarge]
The tower is at 1812 Boren Ave.

Crews poured 4,500 cubic yards of concrete last weekend to finish the mat foundation for AMLI Residential and Mortenson Development's 41-story residential tower in Seattle.

The tower is at 1812 Boren Ave., on the same half block as Tilt49, an office complex being developed by Touchstone, URG and Principal Real Estate Investors.

Mortenson Construction, an affiliate of Mortenson Development, is building both projects and ZGF Architects designed both.

Last weekend's pour required 430 loads of concrete and five placement booms. The concrete is strengthened by 2 million pounds of rebar.

Seattle-based structural and civil engineering firm Magnusson Klemencic Associates designed the foundation, which required excavating more than 130,000 cubic yards of soil.

The residential tower will open in 2017. It will have amenity spaces on the 12th and 41st floors, including barbecues on a rooftop deck. There also will be a private party room with outdoor dining area, a kitchen for large parties, fitness center and yoga studio, media room, conference rooms and co-working spaces, a bicycle maintenance and storage area, and a pet spa.

The 393 apartments will range from units with exposed-concrete ceilings and industrial-style interiors to penthouses with condo-quality finishes.

Mortenson expects to finish the residential tower sometime in 2017 and finish Tilt49 in the second quarter of 2017. It is targeting LEED gold for the residential tower.

Tilt49 will have 220,000 square feet of office space on 11 floors. The half-block will also have a five-level, 509-stall underground parking garage and ground-floor retail space.

A Mortenson news release says the projects — and the recently finished Hill7 office and hotel project across the street — are revitalizing the Denny Triangle from an area of surface parking lots and auto service centers.

Mortenson built Hill7 and Touchstone is the developer.