Just saw a Prestige Bommanahalli flat, total cost confusion.

After years of renting, it's clear builders hide way too much in the final cost. I'm checking a Prestige project in Bommanahalli for a 2BHK around ₹1.1 Cr. Is it even possible to negotiate on these prices? Matlab, kitna off kar sakte hain? Aur possession ke time kaunse hidden charges pakka aate hain? PLC, OC, GST ke alawa aur kya dekhna chahiye? Want to avoid last-minute shocks.