Sunpura flat: My negotiation lessons learned

Sunpura mein Blessings Homz ka flat liya recently. Possession March mein mila. Base price pe toh thoda negotiate ho gaya, but yaar, hidden charges ka kya scene hai? Final bill mein maintenance, club membership, OC charges... sab add ho ke itna badh gaya. Kisi ne bataya nahi tha ki inpe bhi negotiation possible hai? Ya pehle hi clear karna chahiye tha?