Four steel-framed buildings over 2 underground parking garages house a total of 573,536 square feet and 1491 parking stalls. Long-span floor beams allowed column-free spaces along the windows on all sides. Permanent soil nailing was used for excavation bracing to reduce the cost of the basement substructure. Special slab-to-wall release details allowed shortening of the large post-tensioned slabs while minimizing slab cracking. Constructed in 1999, the buildings are currently owned by Microsoft Corporation. CPL project.