| Usually if they're indoor sets, they tear them down, or sell stuff at auction. Outdoor sets, depending on where they are, may stand for years. I would imagine all the Buffy stuff is gone. I remember reading that Alyson Hannigan got the knob to the top of the stairs at Buffy's house.
This from Wikipedia:
Setting and filming locations
Main articles: Sunnydale, Hellmouth and Filming locations
Most of Buffy was shot on location in Los Angeles, California. The main exterior set of the town of Sunnydale, including the infamous "sun sign", was located in Santa Monica, California in a lot on Olympic Boulevard.[61] The show is set in the fictional California town of Sunnydale, whose suburban Sunnydale High School sits on top of a "Hellmouth", a gateway to demon realms. The Hellmouth serves as a nexus for a wide variety of evil creatures and supernatural phenomena, and lies beneath the school library. In addition to being an open-ended plot device, Joss Whedon has cited the Hellmouth and "High school as Hell" as one of the primary metaphors in creating the series.[62]
The high school used in the first three seasons is actually Torrance High School, in Torrance, California. This school was used until the residents of Torrance complained about loud sounds at night.[63] The school exterior has been used in other television shows and movies, most notably Beverly Hills 90210, Bring It On, She's All That and the spoof Not Another Teen Movie.[63] In addition to the high school and its library, scenes take place in the town's cemeteries, a local nightclub (The Bronze), and Buffy's home (located in Torrance), where many of the characters live at various points in the series.
Some of the exterior shots of the college Buffy attends, UC Sunnydale, were filmed at UCLA.
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Clubs:
Ohio Bassist #6 | Sadowsky - #181 | Gallien-Krueger #369 | Avatar #61 | DR Strings #9 | Classic-Vibe #1 | Blue Bass #57 | 
