SEATTLE-A two-year project to complete a seismic retrofit of the historic King County Courthouse at 516 Third Ave. has begun this week.

The courthouse, a six-story, concrete frame building constructed in 1914, was damaged in the earthquake that ratted Puget Sound last February. . A 1929 addition brought the building to its current height of approximately 215 feet and created six more stories of courtroom and office space. It is constructed of concrete beams and columns.

The seismic retrofit will be accomplished through the use of a passive damping system that will dissipate the energy of the earthquake by acting like a shock absorber. In addition, code required fire/life safety system upgrades to the existing courthouse will be made.

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