The Treasure Island Development is a 405-acre (164 ha) major redevelopment project under construction on Treasure Island and parts of Yerba Buena Island in San Francisco Bay between San Francisco and Oakland, within San Francisco city limits. The Treasure Island Development Authority (TIDA) is a nonprofit organization formed to oversee the economic development of the former naval station. The Treasure Island Project is being developed by a joint venture between Lennar and Kenwood Investments. The development is expected to cost US$1.5 billion.