Section 23(1)(c) in THE DELHI INDUSTRIAL DEVELOPMENT, OPERATION AND MAINTENANCE ACT, 2010
(c)where the person to be served is a statutory public body or a corporation or a society or other body, if the document is addressed to the secretary, treasurer or other head officer of that body, corporation or society at its principal office and is eitherÂ(i)sent under a certificate of posting or by registered post; or(ii)left at that office;