Something I haven't seen discussed is that these are Operation Condor era tactics, specifically the Dirty War in Argentina. Clandestine detention centers (CCDyE) were hosted in basements, offices, even garages.
Reposted from
WBUR
ICE is detaining immigrants in a Burlington office park building that wasn't designed as a holding facility. Lawyers say conditions there are "abysmal" and "unsanitary."
Comments
https://whc.unesco.org/en/list/1681/