I have been investigating a little bit about what laws apply in regards to using images of building.
These are some laws I came across:
United States Code - Title 17 - Chapter 1 - Section 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.
Japanese copyright law - Article 46
Exploitation of an artistic work, etc. located in open places: It shall be permissible to exploit artistic works permanently located in such open places as mentioned in paragraph (2) of the preceding Article and architectural works by any means not falling within any of the following items: (i) multiplication of a sculpture and offering it to the public by transfer of ownership of its copies; (ii) imitative reproduction of an architectural work and offering it to the public by transfer of ownership of its copies; (iii) reproduction of a work for the purpose of locating it permanently in such open places as mentioned in paragraph (2) of the preceding Article; (iv) reproduction of an artistic work exclusively for the purpose of selling its copies and sale of such copies.
Hong Kong Special Administrative Region of the People's Republic of China copyright law Chapter 528, section 71
Representation of certain artistic works on public display: (1) This section applies to - (a) buildings; and (b) sculptures, models for buildings and works of artistic craftsmanship, if permanently situated in a public place or in premises open to the public. (2) The copyright in such a work is not infringed by - (a) making a graphic work representing it; (b) making a photograph or film of it; or (c) broadcasting or including in a cable programme service a visual image of it. (3) Nor is the copyright infringed by the issue or making available to the public of copies, or the broadcasting or inclusion in a cable programme service, of anything whose making was, by virtue of this section, not an infringement of the copyright.
All info was found online. I am not a lawyer and I will not warrant the correctness of the info stated above.