At first glance, it’s hard to imagine that this gorgeous light-filled building was once an uninspiring concrete monolith. It’s a testament to the architectural might of Perkins + Will, which transformed the 1940s military warehouse in San Francisco into the LEED Gold-certified Bay Area Metro Center. Constructed with recycled materials, this eight-story adaptive reuse project features soaring ceilings with state-of-the-art offices, community hearing spaces, a boardroom, and ground floor retail. Located at 375 Beale Street, this massive 525,000-square-foot building once served as a navy supply warehouse during World War II and exuded an air of impenetrability with its fortress-like facade.