My hunt for Bengaluru's 'real' property price

Visited a couple of Prestige and Sobha projects near Sarjapur Road last Saturday. Prices for a 3BHK are hovering around ₹1.8 Cr, which feels steep even with the Namma Metro expansion coming. What I'm constantly trying to figure out is the *real* all-in cost. Builders quote the base price, but then you get hit with stamp duty, registration, PLC for higher floors, parking, and those 'clubhouse membership' fees. Honestly, it adds up fast. I've seen some Arvind Smart Homes projects too, and the payment plans are always a puzzle. Is a construction-linked plan always smarter for an investor, or can you leverage a down payment for better negotiation? From my experience, negotiating more than 2-3% off the quoted price is tough in Whitefield. Any hacks for getting builders to budge on the final cost, especially on the 'hidden' charges?