Except as provided in subsection (b) of this section, a petition to gate and green an alley or a petition to green an alley for which gating already has been approved must be accompanied by the signed consents of 100% of the owners of all abutting properties. If 1 or more abutting properties are unoccupied or abandoned and, notwithstanding due diligence, their owners have not been found, the petition may still be filed and considered if:the petition is accompanied by the signed consents of 100% of the owners of all occupied properties abutting the alley; the properties for which signed consents have been obtained constitute at least 80% of all of the properties, not including any abandoned properties, abutting the alley; and the petition is accompanied by an affidavit, made under the penalties of perjury, that:describes and substantiates diligent attempts made by the petitioners to obtain the consents of 100% of the owners of all unoccupied properties and abandoned properties abutting the alley; and affirms that no owner of any abutting property has refused to sign a consent or otherwise is known to object to the petition. Ord. 07-409 Ord. 15-405