On the mission where you need to ge tthe blue prints for caligulas casino you go to the city plans building. Well go to the top floor and go into the first room on the left when your at the top (same level wit the blue prints) go into the left room and look on the wall, there is stalkweathers bluepring for his house(the mansion) top left corner of it it says Stalkweathers layout or some shit. its cool.