Whom should i approach in bangalore indiranagar bbmp office to check if the site i bought is not registered to someone else?

I bought a site for which Iam trying to see if it is registered already to someone else. My purchase falls under Bangalore Indiranagar BBMP office jurisdiction. Whom should I approach with my sale agreement document (which is not registered yet) in BBMP office to see if it is not registered to someone else?