If I built a mansion, I would want it to be full of servant's passages, for two reasons. It would give them the ability to appear and disappear from rooms without the need to pass through other areas, and it would also give them their own space, the shadow house, where only the servants go. It would be tricky to design such a place without appearing to have done so, but I would like to try.
Mokalus of Borg
PS - Anyone want to give me the money to try?
PPS - Maybe I should just try it in The Sims.