Which documents to verify when buying a house in wapda town lahore

Hello,
One of my friend is looking to buy a 5marla house in phase1 wapda town lahore. He is worried about the fraud etc.
My question is:
1. Is it safe to buy in wapda town?
2. Which documents to verify when buying a house in wapda town lahore?
3. What kind of frauds are expected in this file system that we should take care?


Thanks in advance for your expert guidance.