My ROI hunt in Noida Extension's resale market

Zeta II, Greater Noida — I'm seeing interesting movement in secondary market deals, especially with Ashiana projects. New launches often have 'no-negotiation' policies, but from my experience, you can push for 3-5% off on the stated price. For investors, is the real play in secondary market where negotiation room seems higher? I'm calculating total acquisition cost including stamp duty. What are your hacks for maximizing deal value in Noida Extension?