1. Technically you shouldn't buy those flats unless release by GHMC/HMDA as those are under mortgage. If builder violates the approved plan, GHMC has rights to take over those mortgaged flats and sell them. Builder can make agreement, but can't register the apartment under your name unless released from GHMC.
2. Bank don't offer loan, as technically Builder doesn't own it until released by GHMC.
3. The mortgage will last till the builder obtains OC for the entire flats/apartments
4. your builder have to show certain documents like original sale deed,possession certificate\'mou agreement with owner, in some cases if the builder didn\'t got absolute right but only you with owner the owner will resolve some flats to his own. We have to verify them, after verifying
all these documents than you have to come into agreement with builder that to only part payment before and only full favour afterwards.