Reclamation is the act of returning something to a former, better state. Land reclamation might involve razing a strip mall and planting crops.
Reclamation is the noun form of the verb to reclaim. Most people involved in reclamation want to reclaim something out of a sense of moral or environmental duty. Since re- means "again," it makes sense that a reclamation involves restoring something to its former glory, especially something that has gone to the dogs. Anything that's fallen on hard times is a good candidate for reclamation.