I would purchase 1500 acres and assemble a team of out of work engineers, construction people, transgender youth and adults, homeless, artists, and disabled people. We would push through the zoning and permits, put in the sewage and utilities, and convert fifty five thousand surplus shipping containers into modular, portable homes that could be bolted to slabs in the new village, but could also be transported easily and reconfigured as needed using a common set of shared components. (I designed this system once). Families or people starting home businesses could combine multiple container modules, which they would gradually own through their work for the village commons or achievement of other goals. In one year we'd have permanent housing and work places for 100,000 displaced people. It would cost so little per person, once the kinks were worked out, that we could replicate it elsewhere, selling commercial units to those who could afford it to subsidize the units of those who could not, and working with government and nonprofits to get people permanently off the streets and into new communities, with treatment facilities and parks located right in the villages next to the new stores and open source teaching facilities.
