CSS does not routinely provide tours of it's facilities, typically because we're occupied most nights with surveying and telescope operational tasks; we surely don't want any near-Earth asteroids slipping through our survey net! Fortunately, there is night-time access to the Mt Lemmon site through the Mt Lemmon Sky Center, operated by Steward Obsertvatory. The Sky Center operates several programs available to the public including the opportunity to observe through their summit telescopes which are adjacent to a couple of our telescopes. Please contact the Sky Center directly.