Avalon Towers brought high-rise luxury apartment living to the north end of the growing retail core in downtown Bellevue. The project features two towers, one 15 stories and the other 24 stories, over four podium levels of private parking and retail space. The mixed-use community includes a private landscaped courtyard, a club room, exterior terraces and a green roof.
The structures consist of cast-in-place concrete frames with post-tensioned floor slabs. Seismic loads are carried by shear walls located at the stair and elevator cores.
Avalon Towers is the first building in North America to use 90 ksi reinforcing steel for seismic confinement. This reduced steel tonnage quantities, enhanced buildability, and reduced overall construction cost. The use of 90 ksi hoops and ties allowed use of 10 ksi concrete in the shear walls and columns. This resulted in thinner walls and smaller columns, which would have been very difficult to achieve with traditional Grade 60 rebar.
The project achieved LEED Silver certification, with features such as water efficient plumbing fixtures, low flow irrigation systems, and reduced energy consumption through exterior shell design and building systems.
2013 Honors Award Winner
Concrete Reinforcing Steel Institute
U.S. Green Building Council