wasn't the Lookout Mountain Laboratory in the documentary linked by Q?
Jan 12, 2015 11:00am PT
Jared Leto Buys Former Los Angeles Military Compound (EXCLUSIVE)
https://variety.com/2015/dirt/real-estalker/jared-leto-buys-former-los-angeles-military-compound-1201402725/#article-comments
The Laurel Canyon compound, often referred to as the Lookout Mountain Laboratory and/or the Lookout Mountain Air Force Station, was originally built in the early 1940s and was used until the late 1960s as a military film studio where, among other classified projects, a small army of filmmakers and photographers with top security clearance made training films and documented military research on atomic bomb tests.
https://en.wikipedia.org/wiki/Jared_Leto