I witnessed something just like this...

Secret Man Caves Found in EPA Warehouse:

...A warehouse maintained by contractors for the Environmental Protection Agency contained secret rooms full of exercise equipment, televisions and couches, according to an internal audit.

EPA's inspector general found contractors used partitions, screens and piled up boxes to hide the rooms from security cameras in the 70,000 square-foot building located in Landover, Md. The warehouse -- used for inventory storage -- is owned by the General Services Administration and leased to the EPA for about $750,000 per year....

I used to own a bookstore. It was called Civic Center Books, and it was close to SF's Federal Building. (The old ugly tyrannical one, not the new ugly nihilistic tyrannical one.) The State Building was close too. My main customer base was government workers. A nice bunch in general.

But there was one ugly and smelly middle-aged guy I could have done without. He always wore the green uniform of the people who clean and maintain the Federal Building. And his outfit was always sort of grimy and greasy, as if it hadn't been washed in a long time. Smelled like it too. Every day he came in and bought two copies of the Wall Street Journal.

Then one day we read in the newspaper (remember them?) that it had been discovered that he'd been living in a store-room of the Federal Building for 20 years!