A man peeking out a window of a merchant building.
A man is looking out a window.
Peeking and looking out of a window are the same concept and can be used appropriately in this context.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & a_out(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_peek(e1) & of(x3,x4) & n_building(x4) & of(x4,x5) & n_merchant(x5) & n_window(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(out(e1,x2) & n_window(x2) & Actor(e1,x1) & v_look(e1) & n_man(x1))