I give myself very good advice, But I very seldom follow it. That explains the trouble that I'm always in.
Can a 2 architect place a 4th story on a building that is on a 2 space?yes. to restate the example above, a 2-architect could put an apartment building on a space with a 2 on it or in the second quadrant. both of these things can happen in an empty square or on a square which already holds an apartment building. last, this 2-architect could instead opt to place the apartment building on ANY square in ANY quadrant on your board IFF it is being placed as the second (relating to the "2" of the 2-architect used) floor of a previously placed apartment building.