I have to admit...
... that figuring out Building Type A was a little tricky. It took me about 90 minutes of searching before I found the path that worked.
But I WILL tell you that between the post and the comments, you have all the information you need.
My hint, though, was the observation I made that the "horns" at the top of the building are an add-on to the building itself. They're commonly used for these kinds of manufacturing buildings.
In this sketch, the black horns + the M-shaped piece are all thought of as one unit that sits on top of the building.
FWIW, I made this sketch in the hopes that doing an Image Search on this would give me the right answer. But it didn't work out; I got lots of nothing with this.
On the other hand, now you know: All of the information (key terms and concepts) you need is right there in front of you.
Search on! Tell us how it's going for you?