Gurugram secondary market mein negotiation kitna possible hai?

My Gurugram portfolio needs expansion, but prices seem stiff. Kya Sector 7 mein Nanu Ram Goyal And Co jaise builders se negotiation possible hai? Kitna discount expect kar sakte hain? Also, secondary market mein resale properties par zyada negotiation scope hota hai kya? I'm worried about hidden charges at possession, is it significant?