please read terms of agreement . signed by you with the board . if under agreement there is a clause that time is essence of contract then board has to deliver possession within the stipulated period . there must be clause that in case of delay in delivery of possession board will compensate all the flat owners who have purchased flats . if it is agreed that total consideration for flat is an X amount then board cannot call upon you pay for costs escalations in the project .
as per supreme court judgement car parking slots cannot be sold by builder as it forms part of common area .
