To verify the builder's authenticity and the land's documentation, follow these steps: 1. *Pattah verification*: Visit the local tahsildar office or revenue department and ask to verify the pattah document. They can confirm its authenticity and provide details about the land ownership. 2. *CMDA approval*: Contact the Chennai Metropolitan Development Authority (CMDA) directly to inquire about the status of the land's approval. Provide the application number or other relevant details for their reference. 3. *Land records*: Visit the local sub-registrar office or district registrar office to inspect the land records. You can verify the land ownership, encumbrances, and other details. 4. *Builder's credentials*: Research the builder's reputation, previous projects, and regulatory compliance. Check for any legal disputes or complaints filed against them. 5. *Documentation*: Request the builder to provide copies of relevant documents, such as: a. Pattah document b. Land deed c. Sale agreement d. Building approval plans e. CMDA approval letter 1. *Legal consultation*: Consider consulting a lawyer specializing in property law to review the documents, verify the builder's claims, and ensure your interests are protected. 2. *Site visit*: Visit the land and verify its location, boundaries, and any existing structures. 3. *Neighborhood inquiry*: Talk to local residents, nearby property owners, or village elders to gather information about the land and the builder's reputation. Remember to stay vigilant and thorough in your verification process to avoid any potential pitfalls in your property purchase.