Government identifies optimal residential location for facility. Invites largest residential land owner in that location over. Place land lenders head in guillotine. Presents document to sign over land to the government assuring them they can maintain possession of their head in turn. Validate signature. Remove head so they can’t claim they signed under duress.

If they refuse to sign then remove head and forge signature.

Needs strict compartmentalization. Group A identifies optimal location and knows nothing about anyone else.

Group B finds land owner but knows nothing about why or who it’s for.

Group C secures ownership transfer documents and sends to a drop box

Group D delivers landowners to intake facility but knows only who they are getting and to where.

Group E transports landowner to meeting facility/room.

Group F picks up transfer documents and holds meeting with land owner. Sends documents to city hall.

Nobody knows or talks to anyone outside of their group or is provided any information on why they are performing their portion of the process. Group F needs to be strictly limited to a very small number of people. Vetting for group F is done by kidnapping a potential candidates young children and spouse while leaving a note where they are to report for work. Perform their duties for six months to have their family safely returned. During the exit interview remind the group F individual and kidnapped party that all group F members that have ever been involved in the history of the program, their family along with any subsequent family members will be executed should they ever speak to anyone regarding the existence of the program.

Cities have more property than you’d think. They homd a lot of it so they don’t get locked out of being able to do things like this.