The Custom House

The Custom House is an eighteenth-century building in Dublin which houses the Department of the Environment, Heritage and Local Government. It was designed by James Gandon to act as the new custom house for Dublin Port. It has been completed in 1791.
As the port moved further downriver, the building's original use became obsolete, and is now used as the headquarters of local government in Dublin.

Source : [The Irish book of Lists, Julian Ashe]