So, my new suggestion for a building is a War Museum.
In it, survivors would be able to find antique weaponry, such as muskets and weapons from the WWII era, as well as period clothing. (WWII army helmets and uniforms, ETC.)
There would be very little, if any, ammunition, but many of the weapons used in WWII use ammunition that could be plausibly found in other places.
A few weapons that could be tied in with this would be:
M1 Garand (8-round semiautomatic rifle, would have to make a “ping!” sound after the last shot was fired for extra realism) (.30-06)
Thompson M1A1 (20/30-round submachine gun, could have 20 rounds be the default and 30 rounds with extended magazine.) (.45 ACP)
Springfield M1903 (5-round bolt-action rifle.) (.30-06)
Browning M1919 (Can’t remember how many rounds one of these had in a belt, but it was a light machine gun.) (.30cal)
M1 Carbine (15-round semiautomatic carbine, could also include a lighter M1A1 variant like paratroopers would use.) (.30cal)
Winchester 1897 (pump-action shotgun, held six shells iirc) (12ga)
MP40 (32-round magazine German submachine gun) (9mm)
Luger P.08 (8-round semiautomatic German handgun) (9mm)
Sten (32-round magazine British submachine gun) (9mm)
You could also add in a couple new professions, like Night Watchman (could spawn in either a museum or a warehouse with a flashlight and uniform, not sure what his skills would be, though) or Museum Curator (spawns in with tweed suit, not sure what skills here either.)
The museum would have a few alarms here and there that players would have to watch out for.
Just a suggestion, constructive criticism is more than welcome.