1000 Denny Seismic Retrofit
MKA introduced several seismic and topographic design innovations to successfully retrofit this eight-story office building, which was completed over two phases and serves as the headquarters of the city’s daily newspaper of record. To accommodate the site’s difficult slope, which caused torsional irregularities in the existing lateral-resisting system, MKA recommended stiff concrete shear walls at the lower four levels and two-story, concentrically braced frames made of steel pipes at the upper four levels. MKA’s seismic upgrade mitigated the most significant deficiencies during the project’s first phase, while the City of Seattle allowed the remaining expenditures to be spread over a longer period. MKA also performed a Probable Maximum Loss study of the retrofitted building in accordance with ASTM E2557-07.