Edit: I figured it out. It's the room dividers. For some weird reason when they're used the game sees one part of the divided room as not part of the apartment. I'll attach a screen shot for those who need a reference.
All you have to do is move your sims out, change the lot zoning to residential, save/exit/re-enter, remove the room dividers, change the lot zoning back to apartmentbase, save and move your sims back in. And everything should work fine!
