1. If the extra room and mezzanine structure are built in accordance with municipality approved plans then there should not be any problem
2. If the construction as above is done without approvals then in future when the building goes for redevelopment, you will be entitled to carpet area plus extra area taking into account the carpet area which reflects in the sanctioned building plans
3. So just check the original building plans plus any subsequent amended building plans and ascertain the carpet area of flat as per those plans
4. Generally when a deal of this nature is cancelled by buyer then the seller can forfeit 10% of the amount so far paid and return balance to buyer without any interest
5. This is generally stated in pre sale MOU but not necessarily. It depends on mutual agreement between parties
6. Now in your case there is no MOU, so the seller couple at the highest can retain 10% from 2 lacs ie 20k and return balance to you
7. It is not concern of the buyer as to where the seller has invested the money in the meanwhile
8. If deal gets cancelled then seller has to make refund after above deduction
9. If seller is not agreeing then you will have to issue a legal notice to them stating that you have a charge on their flat to the extent of 2 lacs plus interest thereon till the said amount is refunded
10. You can address this letter to the society as well stating that it should not transfer the flat to any other buyer without first your money being refunded
11. If you want to put more pressure on them to return your money you can also issue a public notice in newspapers informing about your charge
12. I would not advise for a suit as it takes long to get resolved
13. You can also address above letter, as in cc it, to local police for record
No the 10% deduction is not mandatory. But generally parties agree to such terms
So instead of enlarging the controversy it is always better to forego some amount and take your balance
If the seller is not agreeable to that too then you must take the steps as suggested in my earlier response