IRVINE, Calif. (AP) - One of the nation's biggest home builders will pay $1.05 billion to buy a former Marine base in Orange County after winning a six-week online auction. Lennar Corp. will build 3,400 homes on the land, while a section of the base is also slated to become one of the largest urban parks in the nation. The Miami-based developer will pay $649.5 million for the base and an additional $400 million that the city of Irvine will use to create the planned "Great Park." The company estimated that it will pay $1.2 million per developable acre, which...