people stand outside a building.
A group of people are walking past a tall building
Although people do stand when they walk it is not usual to describe them this way.
exists e1 x1 x2.(outside(e1,x2) & n_building(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e1 s1 x1 x2 x3.(past(e1,x3) & n_building(x3) & a_tall(s1) & Theme(s1,x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_group(x1))