Kids playing ball outside in front of building.
Kids are playing ball outside of their mother's place of work.
Just because they are in front of a building doesn't mean its a place of work.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x4) & of(x4,x5) & n_building(x5) & n_front(x4) & r_outside(e1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_ball(x3) & (x1 = x2) & n_kid(x1))
exists e1 x1 x2 x3 x4 x5.(of(e1,x4) & of(x4,x5) & n_work(x5) & n_place(x4) & of(x4,x3) & n_mother(x3) & of(x3,x1) & n_thing(x1) & r_outside(e1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_ball(x2) & n_kid(x1))