to the petitioners seeking explanation as to why they should not be evicted from the premises. Sub-section (2) of Section 4 of the Act deals with issuance of notice to show cause against order of eviction. A bare reading of sub-section 2 of Section 4 of the said Act, makes it clear that Notice should specify the grounds on which the order of eviction is proposed to be made. Further, clause (4) of sub-section 2 of Section 4 deals with the formation of the opinion of the Enquiry Officer and the reason for the authority to believe that the person is in occupation of public premises and in such cases, a copy of the notice to be issued on the said person. It is evident from the usage of the word 'reason to believe', which is nothing but formation of a rational opinion by the authority concerned. On a perusal of the notice issued by the Commissioner, the reason for which the notice has been issued is very much evident. The Commissioner has in fact opined that the petitioner is an unauthorised occupant and not paying any rents to the Corporation. Therefore, the notice clearly contains the reasons and grounds on which the order of eviction is proposed to be made and, therefore, it is not open to the petitioner to contend that the notice issued by the Commissioner, being the Estate Officer as defined u/s 2, is violative of Section 4 of the Act is wholly unsustainable.