The legal documentation requirements for purchasing plots on Radial Road typically include documents like the sale deed, title deed, property tax receipts, Encumbrance Certificate, land survey records, and approvals from local authorities for construction. Additionally, buyers may need to verify compliance with zoning regulations and obtain a No Objection Certificate (NOC) from relevant authorities. It’s essential to engage a legal expert or consult with local authorities to ensure all necessary documents are in order before finalising the purchase.