7700 Central


This commercial and residential mixed-use development in downtown Mercer Island occupies an entire city block. The four above-ground buildings are supported over a common parking garage that occupies the full extent of the property. Soldier pile shoring was required for all four sides of the excavation to restrain the surrounding streets while the basement excavation was made. Portions of the shoring required tieback anchors, some of which extended into the Interstate 90 right-of-way. Poor soil conditions necessitated over-excavation and replacement with imported rock fill for a portion of the foundations.