SAN DIEGO–The County Board of Supervisors approved three projects Wednesday that could ultimately provide nearly 4,000 homes to the region. Two are housing projects in the North County near Interstate 15 and state Route 78. A third is a land use change to introduce housing in the South County east of state Route 125, according to Harmony Grove Village South is designed as a mixed-use community on a 111-acre site south of Harmony Grove Village and about a mile from both San Marcos and Escondido. The site will include 453 single-family and multi-family homes, 5,000 square feet for commercial and civic uses, four acres of parks, two miles of multi-use trails, 36 acres of common areas and about 35 acres of open space. The Valiano project is planned as a residential community on a 239-acre site north of Harmony Grove Village. The project is located southeast of San Marcos and west of Escondido. Plans include 326 single family homes and detached condominiums, 7.9 acres in parks, 31 acres of open space and 2.6 miles of trails. An equestrian staging area is also included in the plans. The third site named Otay 250 is located east of State Route 125 and north of Otay Mesa Road. The project changes the land use at the 253-acre site to potentially build 3,158 homes in the future. Otay 250 would include multi-family housing, duplexes, townhomes and single-family homes. Plans also call for 78,000 square feet for commercial use such as shopping centers, grocery stores and restaurants. Another 765,000 square feet is set aside for research and development business, medical services and custom manufacturing. The project also includes more than 51 acres of open space and 8.6 acres of public park land.