Just got possession, some things genuinely surprised me

Not proud of this but I almost got duped by focusing only on base price. Just moved into my new place in Gurgaon last month, and the *actual* cost was way higher than the advertised rate. For AVL 36, they quoted ₹47L for a 1BHK but with stamp duty, registration, PLC, and those 'internal development charges', it easily crossed ₹55L. That's a huge jump! Was also looking at DS Heights briefly, and I wonder if their 'starting price' is just as misleading. What's the real per sqft for DS Heights after everything? Anyone who recently bought there, can you share the hidden costs? Things nobody tells you upfront. Did you negotiate any of the 'extra' charges? Hope this helps someone avoid my shock.