1. Since it's a residentially converted place, and if the title to the property is clear without ambiguity, then the property can't be considered as illegal and the Government will not demolish it. However , the correct opinion can be given subject to verification of documents.
2. The betterment charges may have to be paid in future.
3. To get ratification of the modified constructed building, please obtain necessary plan sanction from the BIAPPA.
4. Since the layout is carved on the duly residentially converted piece of land, such a site qualifies for 'A' Khatha.
5. However the above should not be construed as legal opinion, since I haven't seen the documents.