Here is that exact same drawing (which turns out to be the top view), along with 2 more views of the same thing, from the side, and the front.
As soon as you see all 3 views, it immediately becomes clear that it is a small house (or, maybe not a complete house; more of a guard shack), with a sloped roof, and a chimney.
So . . . the next question becomes, "What does the
FOURTH view . . . the TETRAHEED view . . . look like?"