From: Rabbi Moshe Sofer
To: Rabbi Falk
When one sells chametz to a non-Jew before Pesach and rents him a room to store it, must the seller perform bedikas chametz in that room? The Chasam Sofer rules there is no obligation, distinguishing between obligations on the property versus the person.
Source: Shu"t Chasam Sofer OC §131