Rockridge Geotechnical (RG) performed a geotechnical investigation, a seismic assessment, and construction observation services to support the renovation and seismic retrofit of the historic Armory building. Rockridge Geotechnical's investigation identified a potential for liquefaction across approximately half of the building's footprint. The presence of Bay Area Rapid Transit (BART) tunnels along Mission Street adjacent to the existing basement further complicated retrofit strategies. The selected foundation scheme for the retrofit consisted of a combination of vertical and battered micropiles and helical mini-piles. The piles were installed from the existing basement with limited-access equipment, and they provide the necessary foundation support in the event of liquefaction while also complying with construction requirements in the vicinity of BART tunnels.