Trees obscure a building to the right.
There are trees near that building.
Trees could obscure a building without being near to it.
exists e1 x1 x2 x3.(n_right(x3) & ne_nam_trees(x1) & to(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_obscure(e1) & n_building(x2))
exists p1 x1 x3.(n_building(x3) & exists x2.((x1 = x2) & near(x2,x3) & n_tree(x2)))