My campus had a range of buildings from brand new to 300 years old. I never found anywhere that the key didn't work, although I didn't try in residences or plac

My campus had a range of buildings from brand new to 300 years old. I never found anywhere that the key didn't work, although I didn't try in residences or places likely to have money. It for sure worked in newer and older buildings. I think it was used by facilities so that they could clean, although I can tell you there were a lot of places they could have cleaned that they clearly didn't. ;)