I feel like #1 was cropped too tightly.. but like the idea.
#2 and #3 don't really strike me all that much.
#4 is also a nice idea, good use of shapes/symmetry.. but also don't like the crop on this one. I think a little lower so you don't cut the top/bottom windows in half... and also, this might look good in B&W.
EDIT: Oh, and maybe some perspective correction in #4, unless you just intended the look, in which case power to ya.