The fraternity, Sigma Chi, wants Stanford to pay at least $35 million for not allowing members to move back into 550 Lasuen Mall, where they had been since 1937. That's how much buying new land close to campus and constructing a new building would cost, the lawsuit said. Sigma Chi said its parent corporation has invested an estimated $46 million in the house, and the lease was "renewed indefinitely" in 1976.