THE ICONIC FRANK LLOYD WRIGHT–designed Marin County Civic Center, built in the 1960s, has recently been in need of some TLC. Water pooling between the roofing layers over the years prompted several major roof repairs, but they haven’t sufficed. In 2015, a part of the ceiling collapsed into a hallway. Accordingly, the board of supervisors approved a $991,000 design and management contract for the services of Wiss Janney Elstner Associates Inc., a firm recognized nationally for expertise in completing architectural projects of historical significance. The full project is set to be completed in three phases over the next three years and will cost about $21.2 million, making it by far the largest construction project at the Civic Center since it was built. The first phase is scheduled to begin next summer.