Here are the important documents that need to be ready for buying a flat in Noida: 1. A copy of the sale document providing the seller with land ownership, 2. All the copies of preceding sale deeds for the property’s past owners, 3. Sale deed registration, 4. Property Sale Agreement, 5. Receipts for payments made by the buyer, 6. A copy of the sale deed for registration purposes, 7. Other proof of identity and proof of address documents.