Rebuild the rest into apartment homes.
If possible, provide some space for a little gardening and at least a little space for children to play outdoors. Provide space for hanging clothing to dry outdoors, even if it is some kind of racks that can be extended and retracted from the windows.
Include courses to help students ascertain where they can best use their skills, contribute to the community, and make a living, as well as learning job search skills. Make at least one such career preparation class available to each student in the high school curriculum.