In a bit of real estate theater, what once passed as a comfortable four-bedroom 1930’s-era home has launched a bidding war — not for the house, but for the dirt beneath it. The property at 123 Stockbridge Ave. in West Atherton traded hands for roughly $9.5 million as a 1.147-acre lot. The home brought in 14 offers both from real estate developers and families looking to build something from the ground up. Atherton, a wealthy enclave south of San Francisco, has long been a playground for the