need info and advice for a New but 1 year old Flat.

Q: *I have finalized a 3BHK flat in Purnima classic which is JV between land owner and the developer in Basapura near Hosa road junction near Concorde Midway city, which is New but its 1 year old flat with built up area of 1719Sft. The apartment society had not been formed yet.
*Builder quoting 3k/sft(negotiable). Which makes it RS.51,57,000 basic cost for just the flat.
*But he is charging additional 2 lakhs for parking,
*Deposits 2,57,850(Rs150XSFT),
*VAT & TAX @8%(Basic cost+Car parking +deposits=4,49,188),
*Registration(1500rs X AREA+ Car Parking X 6.6%=1,78,035)
*So the Total cost of the flat is coming up to
Rs.63,03,115. which is 11,46,115 extra from basic cost of the flat.
Can any one plz advice me on this additional costs and taxes are legitimate? And what are the things I should point out while negotiating with the builder? What are the Usual additional costs and taxes apart from the basic price of the Flat?

Any advice is highly appreciated.
Thank you.