Please verify the terms of agreement. If it provides for construction of security cabin, name board of the premises, and name board of the flat owner, the builder is bound to provide them. Regarding allotment of car parking, verify the terms of the allotment, whether it is on ownership basis or only right to use, whether the allotment is registered and what the term of agreement about allotment are. If there is any deviation; the association may take up with the builder. Khata transfer has to be get done by the individual flat owners by providing ownership documents to the corporation. The builder has to handover the original document to the association. If the builder does not reply your legal notice, you may approach consumer grievance Redressal cell or civil court for relief.