In the event that the total annual income as certified is in excess of $250,000, $175,000, or $200,000 in each such year, whichever applies, as provided in section 2531.2 of this Part, the owner may file an owner's petition for deregulation (OPD), accompanied by the ICF, with the DHCR on or before June 30th of such year. The DHCR shall issue within 30 days after the filing of such OPD, an order providing that such housing accommodation shall not be subject to the provisions of the RSL upon the expiration of the existing lease. A copy of such order shall be mailed by regular and certified mail, return receipt requested, to the tenant or tenants and a copy thereof shall be mailed to the owner. Service shall be deemed to be complete upon mailing by the DHCR.