Ansal API Airport Road: Builder agreement mein hidden charges?

₹8 lakh extra, just after booking my Ansal API flat on Airport Road, seriously got me thinking. Builder-buyer agreement mein PLC, IDC, aur maintenance advance ka breakdown itna hidden tha. Matlab, brochure mein toh kuch aur hi dikha rahe the. I had no idea yeh sab add hoga. Mere parents bolte the, always budget for extra, but itna? Ab samajh nahi aa raha kaise manage karun. Has anyone else faced such huge hidden costs post-booking in Gurugram? What's the best way to spot these red flags pehle hi?