Section 4(1)(a) in Delhi Stamp (Prevention of Undervaluation of Instruments) Rules, 2007
(a)The Government may, from time to time, notify the minimum rates for valuation of land through a notification in the official Gazette, for various districts/areas forming part of the district, on recommendation of Deputy Commissioner concerned or otherwise which shall be effective from the date of the publication of the notification in the official Gazette or as specified in the notification.