Noida Extension negotiation for remote investors?

₹85 lakh for a 2BHK in Panchsheel Green feels high, even with all the Jewar Airport buzz. I'm based in Dubai, so I can't do site visits easily, relying heavily on community insights. What's the realistic negotiation room with builders like Greenarc Homes in Noida Extension? Are they firm, or can one genuinely knock off 5-7% on a 3BHK, especially when buying remotely? Also, for an investor, are construction-linked payment plans always smarter than a lump sum down payment for better ROI? Or should I just look at secondary market deals in Sectors like 137 or 150 for better negotiation leverage? Any tips for securing a good deal remotely?