Bommanahalli compact flat — hidden costs ka darr

Bommanahalli — we're looking at flats there, kids have moved out so need something smaller. Keya Homes ka ek project dekha hai. Ismein price negotiation kitna possible hai? Matlab, they quote ₹1.2 Cr for a 2BHK, can we actually knock off much? Aur what about hidden charges? PLC, OC, maintenance deposit — sab mila ke kitna upar jaata hai? Don't want surprises later.