Noida Extension's true property cost: What nobody tells you

Moved into my Shree Homes flat in Sector 127 last month. My 2BHK agreement was ₹85L. But all-in cost with stamp duty, registration, and PLCs felt way higher. Kya sabko itna difference lagta hai? Any unexpected charges at possession? Trying to gauge true total cost for future Noida Extension investments. Is this normal for construction-linked payment plans?