Julian Castro, the former mayor of San Antonio, was sworn in Tuesday as the country’s next Secretary of Housing and Urban Development. Castro succeeds Shaun Donovan who was tapped to head the Office of Management and Budget. During Donovan’s tenure at HUD, he oversaw the Rebuild by Design competition, which selected its winners earlier this summer. Among his many responsibilities in his new role, Castro will likely be heavily involved in the execution of those projects, which include work from BIG, SCAPE, Penn Design/OLIN, OMA, Interboro, and MIT.