Independence Hall was designed by attorney Andrew Hamilton in collaboration with master builder Edmund Woolley to house the Assembly of the Commonwealth (colony) of Pennsylvania. IntegrityWithin the boundaries of the property (the city block known as Independence Square) are located all the elements necessary to understand and express the Outstanding Universal Value of Independence Hall. Also in Independence Square but not contributing to the Outstanding Universal Value of Independence Hall are the two-storey East and West wings and the brick arcades linking them to the Hall, which were built in 1897-98 as approximate representations of long-vanished subsidiary structures that originally housed offices and connecting passageways; Congress Hall, built in 1787-89 as a county court house; and Old City Hall, built in 1790-91. Protection and management requirementsIndependence Hall is owned by the City of Philadelphia and administered by the National Park Service as a part of Independence National Historical Park under a formal agreement with the City. Inclusion of Independence Hall in the National Park system gives it the highest possible level of protection, as it is maintained by the federal government.