L.A.’s Civic Center is a strange mishmash of city, state and federal buildings, dotted by empty lots and awkward pedestrian walkways. And then there’s the L.A. Mall - a hundred thousand square feet of underground retail space that’s only about a third occupied. For years, city planners have been floating ideas to make the Civic Center more cohesive. Now that downtown is booming, there’s a new urgency to re-envision the space.