Here is the list of some essential documents that one should have: ~society registration certificate ~title certificate ~the original building plans ~flat-wise carpet area list ~a certified property card that shows that property is owned by society ~conveyance deed ~sale deed ~structural audit report ~redevelopment agreement ~copy of the new approved plan ~Development Plan (DP) remark (details of the land and its surrounding area) ~essential supplies bill *These are the basic documents required, for more legal forms you can check the redevelopment manual or get expert consultation.