To take it a step further, a photograph of a building is not a copy of a building. Only another building can be a copy of an existing building.
``Sec. 120. Scope of Exclusive Rights in Architectural Works
``(a) PICTORIAL REPRESENTATIONS 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 ordinarily visible from a public place.