Gurgaon home buyers: What's your essential legal verification checklist?

₹1.8 crore for a 3BHK on Golf Course Road – that's a huge commitment. My parents keep insisting on thorough legal verification before even looking at Experion's under-construction projects. They're worried about title issues and RERA compliance. Honestly, I'm not sure what all to ask during a site visit beyond basic amenities. What specific documents should I request from the builder for legal checks? Also, any lesser-known red flags to look for during a site visit? Hope this helps someone else too.