1. You can sell and convey your reversionary interest in the flats in the building to the tenants. So you can register a deed of conveyance of reversionary rights in favour of the tenant for his flat against the consideration to be payable by the tenant to you. This deed has to be stamped and registered. This will confer full ownership right on the tenant in respect of the flat in his occupation.
2. Thereafter all the tenants can form themselves into a society or a company or an association and you can then convey the land underneath the building alongwith the common areas to such society/company/Association.
3. The society as an owner can then submit the property to the provisions of the Maharashtra Apartment Ownership Act by executing a deed of declaration. A deed of apartment has to be made in respect of each flat. So the property will become a condominium wherein the flat owners will also have an undivided share in the land.
4. You can sell your reversionary interest to any willing tenant who wishes to purchase full ownership right. It is not necessary for you to obtain consent of all tenants or of majority tenants to do this exercise. You can sell your reversionary interest to any tenant who is offering a good price for purchase of ownership right. The tenants who do not buy the ownership right would continue to remain as your tenant.