UPDATED 06-17-2021
I’ve heard this rumor a lot over the years, and seen it mentioned online. But nobody seemed to know exactly where “Sweet Child O Mine” was filmed.
I brought this up in a Huntington Park group I’m in on Facebook, and it generated some interesting conversation. Having grown up in HP I didn’t remember any ballroom there, but in the 80’s I left HP and was in film school (for a brief time) in Hollywood.
After much discussion, including a dismissal of an article claiming Huntington Beach was the location of SCOM filming, the actual location was indeed a ballroom at 6130 Pacific Blvd, Huntington Park, CA 90255. It was above a bank at the time. Today, it sits empty and abandoned. A 99 Cent store has replaced the bank.
SCOM took an entire day and part of the night to film. The ballroom was known as the huntington Park Ballroom, then Mendiolas, and for a brief time, the La Rumba Nightclub, which eventually closed due to health code violations. Supposedly Black Sabbath played there once in the 1970’s under an assumed name, but the so-called Punk Rock Riots, also known as the Exploited Riot made it infamous.
Check this article out as well.
Thanks to Letty Martinez, Sergio Ortiz, Jim Ramirez, Yvonne Felissa Salgado, and Alfred Valadez.
SEVENTH PLANET PRODUCTIONS 
Yeah I grew up there during the time that Guns and Roses filmed the video for “Sweet Child of Mine”. Mendiolas Ballroom was basically one business away from the corner of Randolph and Pacific Blvd (right next to the paint store “Standard Brands” that was a spot for us skaters. It was abandoned and you could actually get inside the building through the back alley fire stairs. Inside one could really see how it was a beautiful Golden Era ballroom. A big high ornate ceiling, ample panoramic windows, a balcony, stage etc. It had a strange ghostly feel to it that as amplified by the dark emptiness of the space, broken windows, some remnants of drapes, cobwebs and pigeon hotels all around. We often snuck into that space. It felt like what we listened to… post punk…gothic, in high school. I was aware that the rumor was that Guns and Roses (who I didn’t really care for) shot video in Huntinton BEACH and that the 1983 riot was in Huntington Beach according to posers, but we all were well aware of the location.
I was recently the manager of that 99 and it’s true I would go upstairs Once in a while. The entrance is on the outside
Dude, that’s great! Is there any way to get in there and take pictures?