Originally, Delaware's custom house existed in New Castle, but it was moved to a small rented building on Water Street in Wilmington around 1800.

[4] During the Korean and Vietnam war periods, the Old Customshouse served as the Delaware initial reporting and induction site for drafted soldiers.

[5] The Wilmington Parking Authority built the Customs House Garage, a 1,335 car facility adjacent to the building.

[6] Wilmington University purchased the building from the federal government in 1983 and used it for both business meetings and downtown classes.

[7] In 2018, the building was then sold to the State of Delaware, who plans to turn the space into offices for the judicial branch and community court facilities.