Renovate existing abandoned buildings, use them to house the homeless, and incorporate programs to enable the homeless to gain wealth to eventually own their own home or apartments. This could be done in phases. A community to meet the immediate needs of the homeless to help them become productive members of communities, then they can move to a community of work and pay affordable rent, which will eventually enable them to professional development and opportunity allowing them to move into "normal" societal area/neighborhoods/communities/home ownership.
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