I hope you understand the area where the buildings were demolished were once operated by Rocketdyne. They were a test lab for rocket engines. But the also were a nuclear lab. In the mid 50s they had a melt down with out of control fuel rods. There was an extreme release of radiation that spread across the entire San Fernando Valley. All the beautiful homes up against the hills in Chatsworth and Canoga Park got the worst of it. It's why Roy Rogers moved his ranch to Apple Valley..., (near Barstow). We lived in Reseda and our next door neighbor worked at Rocketdyne. He came home the day it happened and knocked on our door, then stepped back in the driveway to tell my father. His name was Gene Shanks. He didn't last but a couple days. He contaminated his wife and she died a few weeks later. The government never accepted the blame. The lab was contracted to experiment with a new type of nuclear fusion. Search youtube for Rocketdyne and you should find a documentary on the accident. The whole area of the lab will be radioactive for several thousand years.