A crane hauling an air conditioner into the top floor of a 30-story building dropped the heavy load Sunday morning, smashing parts of the building and injuring 10 people. -- Workers were loading the shipping container-sized machine into 261 Madison Ave. when a rigging strap holding the air conditioner broke a city official told the Daily News. Two construction workers were taken to Bellevue Hospital. The remaining injured were being treated at NYU Medical Center, authorities said.