Architectural Works Copyright Protection Act (United States) section 120

a) Pictorial representation permitted. The copyright in an architectural work that has been constructed does not include the right to prevent the making, distributing, or public display of pictures, paintings, photographs, or other pictorial representations of the work, if the building in which the work is embodied is located in or ordinary visible from a public place.

A public place in copyright by the way was defined by the US Supreme Court as "a place to which the general public has access". This would imply that a public place is not necessarily public property under the american law.

Ronnoco