“While 645-foot Millennium Tower in downtown San Francisco stands alone in how much it’s dropped — about 16 inches over a decade, with one side sagging more than the other — big buildings are known to exert downward pressure. Engineers even plan for it. However, the aggregate impacts of building weights haven’t been well studied.” It’s not just that seas are rising. The land is also sinking. SF Chronicle: Buildings like S.F.’s Millennium Tower are causing the Bay Area to sink under their weight.