diligence should know the name of such occupant”; P.A. 86-286 repealed provision added by P.A. 86-210 and amended Subsec. (b) to provide that if owner or lessor, or legal representative, attorney-at-law or attorney-in-fact does not know or cannot reasonably discover the name of occupant, notice may be addressed to “occupant” or “occupants”; P.A. 87-507 amended Subsecs. (a) and (c) to replace “the lessee” with “each lessee” and amended Subsec. (b) to require the notice to set forth “the address, including apartment number or other designation, as applicable” of the premises and to permit the notice to be addressed to an occupant as “John Doe”, “Jane Doe” or some other alias which reasonably characterizes the person to be served, rather than “occupant” or “occupants”, when the owner or lessor “knows of the presence of an occupant” but does not know and cannot discover his name; P.A. 89-254 amended Subsec. (a) to restructure provisions, to insert Subdiv. indicators, to revise in Subdiv. (1) the reasons for the termination of a rental agreement or lease by inserting Subpara. indicators, by replacing “under the provisions of section 47a-15a” with “(D) nonpayment of rent within the grace period provided for residential property in section 47a-15a” and by adding as reasons Subpara. (C) “violation of the rental agreement or lease or of any rules or regulations adopted in accordance with section 47a-9”, Subpara. (E) “nonpayment of rent when due for commercial property”, and Subpara. (G) “nuisance, as defined in section 47a-15”, to replace in Subdiv. (2) “one who has no right or privilege” with “one who never had a right or privilege” and to add in Subdiv. (3) “other than under a rental agreement or lease”; P.A. 90-230 added “or his legal representative, or his attorney-at-law,