(2) The city rent agency, in order to carry out the purposes of this chapter, may issue regulations providing for issuance of certificates of eviction in any case where the landlord seeks such approval in order to use the premises (including the building or land) (a) for the purpose of conducting a business, or (b) where the landlord is a hospital, convent, asylum, public institution, college, school or any institution operated exclusively for charitable, religious or educational purposes on a non profit basis and the landlord seeks such approval in order to use the premises (including the building or land) or any part thereof in connection with the landlord's charitable, religious or educational purposes; such agency, if it grants approval, shall condition same upon compliance by the landlord with designated requirements which may consist of any conditions that such agency would have authority to prescribe by regulation under subparagraphs (b) and (c) of paragraph four of subdivision b of this section with respect to applications for certificates of eviction under such paragraph four provided, however, that such agency shall not condition any such approval granted to a hospital, convent, asylum, public institution, college, school, or any institution operated exclusively for charitable, religious or educational purposes upon compliance with requirements exceeding or less than those applicable to any private owner in similar circumstances. Nothing contained in this paragraph shall be construed as authorizing or requiring such agency to approve the withdrawal of any housing accommodations from the rental market by any landlord for the purpose of using the premises for any business other than one in existence and conducted by such landlord at the time such withdrawal is