A plan has been introduced in our city to "downzone" from residential multifamily/two-family to single family using amortization as the implementation technique. This plan would give property owners a time period in which they would have to replace duplexes with single family homes. After much research I have found no other instances where this has been done. If anyone has any information/comments on any aspect of the residential downzoning process especially using amortization (legality, past experience) it would be appreciated.