how to know if its an all brick building

[Hertzke W.]

in NYC and perhaps other places too, its a big difference between a full brick building (where all 4 exterior walls are from brick) or a building which is frame, even with a brick front wall.

i would really appreciate if anyone could explain me how i can find out on a building with a brick exterior wall in front, and the rest of the three exterior walls are covered with cement, if its all brick from inside?

thanks!