The man is in front of a building
The man is by a structure.
A building is a structure.
exists p1 x1.(n_man(x1) & exists x2 x3.(in(x1,x2) & of(x2,x3) & n_building(x3) & n_front(x2)))
exists p1 x1.(n_man(x1) & exists x2.(by(x1,x2) & n_structure(x2)))