Mill Valley-based Terrence Tallen has joined Gerrity Group LLC, owners and operators of dozens of retail properties in the western U.S., as a principal. Tallen is a 30-year veteran in retail real estate development and investment industry and one of the San Francisco Bay Area’s leading retail investors and developers. He will provide strategic leadership in the redevelopment and repositioning of retail properties and the oversight and direction of portfolio leasing for all Gerrity properties.