San Jose officials ratcheted up their efforts to lure the Oakland Athletics to the South Bay after the City Council agreed to buy an abandoned sausage factory where a ballpark could be built. The council voted unanimously on Tuesday to spend $5.7 million for the shuttered downtown facility. Officials also agreed to spend $700,000 for studies on the environmental and economic impacts of building a stadium. The city is looking to acquire a total of 13.5 acres for the project, which would first need voter approval. A local law prohibits the city from spending public money on a ballpark without voter consent. The studies are needed to produce a ballot measure, and if voters ultimately decide against a stadium the land can be resold or used for other purposes, City Attorney Rick Doyle said. "It's a very, very good investment," said Vice Mayor Cindy Chavez.