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CONTRA COSTA COUNTY, CALIF. — AvalonBay Communities Inc., Millennium Partners, the San Francisco Bay Area Rapid Transit (BART) and the County of Contra Costa are breaking ground for the development of Avalon Walnut Creek at Contra Costa Centre, a transit-oriented mixed-use development in Contra Costa County. When complete, the project will feature 422 residential apartments, of which 85 will be affordable units; 100 condominium units; 35,000 square feet of local service retail space; a civic use area; a 19,400-square-foot business conference center; and 270,000 square feet of office space.