The back of a stop sign is visible in front of the stone building.
There is an office building
The stone building is not necessarily an office building.
exists s1 x1 x2 x3 x4 x5 x6.(n_building(x5) & of(x5,x6) & n_stone(x6) & n_back(x1) & in(s1,x4) & of(x4,x5) & n_front(x4) & Theme(s1,x1) & a_visible(s1) & of(x1,x2) & n_sign(x2) & of(x2,x3) & n_stop(x3))
exists p1 x1 x2 x3.((x1 = x2) & n_building(x2) & of(x2,x3) & n_office(x3))