Rehabilitation (noun)
The process of rehabilitating something.
Restoration (noun)
The process of bringing an object back to its restoring something.
“The restoration of this painting will take years.”
“The restoration of this medieval church involved undoing all the Victorian modifications.”
Restoration (noun)
The return of a former monarchy or monarch to power, usually after having been forced to step down.
“The restoration of the House of Stuart took place a few years after the death of Cromwell.”
Wiktionary