Basic Information
Things to note:
As an NRI, you need no permissions to buy property in India . You can also rent out the property and repatriate your rental proceeds, subject to payment of taxes.

Please remember that an NRI who is an Indian Citizen can sell his Immovable Property (other than agricultural or plantation property or farmhouse) to another NRI. However, the transaction has to be routed through India only. In other words, the buyer has to invest in India by way of remittance from abroad through normal banking channels or by debit to his account maintained with an authorized dealer.

The Sale proceeds of the property must be credited to your bank accounts maintained with an authorized dealer in India .

Legal Information
Things to note:
FAQ on acquisition of residential / commercial premises in India by Non-Resident Indians

Who is a NRI under the provisions of Foreign Exchange Management Act?
Generally, an Indian Citizen who stays abroad for employment/carrying on business or vocation outside India or stays abroad under circumstances indicating an intention for an uncertain duration of stay abroad or a person who is not resident in India for a period over 182 days is a non-resident Indian. Persons posted in U.N. organisations and officials deputed abroad by Central/State Governments and Public Sector undertakings on temporary assignments are also treated as non-residents.