Kala Patthar mein 3BHK: Kya hidden costs bohot zyaada hote hain?

Hidden costs in Ghaziabad property are a real headache, seriously. I'm checking out a 3BHK at Kala Patthar, ASGI Properties ka project. Brochure price looks okay, but I hear delivery ke time bohot hidden charges aate hain. Like OC, random maintenance. Can anyone tell me the *actual* all-in cost? Matlab, property price, stamp duty, registration, parking, PLC, interiors... kitna extra pakad ke chalna chahiye? Is ₹1.2 Cr for a 3BHK in that area realistic after all these? Also, negotiation ka kya scene hai Ghaziabad mein? Builders usually say fixed price. But I've heard logon ko 2-3% tak mil jaata hai. Is this actually possible with builders like ASGI? Should I push for a spot discount, ya time waste hoga? Any tips on how to haggle successfully without losing the deal?