§ 16-505.  Certification.
   (1)   The Blight Reduction Committee and the City Planning Commission, upon making a determination that any property is blighted within the terms of this Chapter, must certify said blighted property to the Redevelopment Authority, except that:
      (a)   No property shall be certified to the Redevelopment Authority unless it is vacant. A property shall be considered vacant if:
         (.1)   the property is unoccupied, or its occupancy has not been authorized by the owner of the property;
         (.2)   in the case of an unimproved lot or parcel of ground, a lien for the cost of demolition of any structure located on the property remains unpaid for a period of six months; or
         (.3)   in the case of an unimproved lot or parcel of ground, the property has remained in violation of any provision of this Code applicable to such lots or parcels, including licensing requirements, for a period of six months.
   (2)   No property shall be certified to the Redevelopment Authority unless the owner of the property or an agent designated by him/her for receipt of service of notices has been served with notice of the determination that the property is blighted, together with an appropriate order to eliminate the conditions causing the blight and notification that failure to do so may render the property subject to condemnation under the Urban Redevelopment Law. The notice shall be served upon the owner or his agent in accord with the provisions of The Philadelphia Property Management Code. The owner or his agent shall have the right of appeal from the determination in the same manner as an appeal from the determination of public nuisance.
   (3)   No blighted property shall be certified to the Redevelopment Authority until the time period for appeal has expired and no appeal has been taken, or, if taken, the appeal has been disposed of, and the owner or his agent has failed to comply with the order.