The Scale House is where U.S. Customs Service equipment was stored.
The Scale House, built in 1829, was used as a storage facility for the scales and other equipment required to weigh cargo that was unloaded from a ship.
The scales were never used in this building. Rather, they were carted to the wharf and assembled alongside a recently returned vessel. There, the goods were weighed and measured, and later duties were assessed on the cargo.