California officials are pushing school districts to convert their surplus property into housing for teachers, staff and even students. Some districts have already started; now the state wants every district to become a landlord. Some superintendents and education analysts are skeptical, saying the idea won’t work everywhere and school districts might be better off focusing on education, not real estate development. But State Superintendent of Public Instruction Tony Thurmond has pledged financial incentives for districts that pass bonds to build staff housing. The move follows a report that says school districts own 75,000 acres of developable land, enough to build 2.3 million housing units — which could wipe out the state’s housing shortage.