Excellent guide to the US Census and American Community Surveys. These have the most detailed social/economic data of the US population - current and historical data is available from the national to the block level. The Social/Economic tab has links to user-friendlier tools for data access.
California Association of Realtors' produce reports about California real estate - forecasts, county summaries, California affordability index and much more. Much of their content is freely available, while some is for members only . Their journal, California Real Estate is also available in print behind the Circulation Desk at the Business Library.
Local realtors associations publish details about their territories. Search the internet for realtors associations for desired area.
Association of Bay Area Governments and Metropolitan Transportation Commission for the Bay area - see their easy to use Vital Signs for the Bay area by county. Contact the MTC-ABAG library for any regional transportation and regional growth planning resources.
Southern California Association of Governments is responsible for formulating priorities for housing and economic development for the more urban southern California counties.
Business Times and regional Book of Lists are available online for major US economic areas. For the Bay area there are East Bay, San Francisco and Silicon Valley editions of the Book of Lists which list the top companies in various fields and includes data on the largest properties and other relevant data for real estate developers or investors. Book of Lists is available in the online Business Times package, and are also available in print at the Circulation Desk at the Business Library as well.
Reports by real estate firms: