A person is looking to purchase a portion of a flat that has been divided by the owner into two separate units, each with its own door and meter. The partition was done some time ago, and the unit has been rented out since. The main concern is whether such a division is legally permissible for separate registration and sale, especially since the property is registered as a single unit. Advice suggests obtaining society permission, relevant documents, and legal counsel, while also questioning the legality of registering a divided flat as independent units.