Flat registration

When the said flat will come into being after construction, then it will be registered as per this sale agreement.

Ideally and Preferably it should be registered.

Show the said agreement to a  very able local senior counsel unshakable repute and integrity  specializing in revenue/property/civil matters. 

Every flat allottee must have possession letter along with occupancy certificte.

The possession letter is issued by the developer in favour of the buyer stating the date of possession of the property. The original copy of this document needs to be produced for securing a home loan. A possession letter alone would not suffice for legal possession of the property unless OC has been obtained.

Occupation Certificate

Certificate of Occupancy or completion certificate is a document which is issued at the end of the construction by a local government agency or planning authority. The document is a proof of the building's compliance with applicable building codes and other laws. It indicates that the property is in a suitable condition for occupancy. The developer is responsible for obtaining occupancy certificate and is issued only once the building has been completed in all respects and is ready to be occupied. A completion certificate is received by the builder from the metropolitan authorities upon completion of construction.

Same Query:

https://www.lawyersclubindia.com/experts/Landlord-s-flat-registration--645666.asp