(1) Except as to complaints of inadequate heat and/or hot water, or applications relating to the restoration of rents based upon the restoration of such services, whenever a complaint of building-wide reduction in services, or an owner's application relating to the restoration of rents based upon the restoration of such services is filed, the tenants or owner may submit with the complaint, answer or application, the contemporaneous affidavit of an independent licensed architect or engineer, substantiating the allegations of the complaint, answer, or application. The affidavit shall state that the conditions that are the subject of the complaint, answer or application were investigated by the person signing the affidavit and that the conditions exist (if the affidavit is offered by the tenants) or do not exist (if the affidavit is offered by the owner). The affidavit shall specify what conditions were investigated and what the findings were with respect to each condition. The affidavit shall state when the investigation was conducted, must be submitted within a reasonable time after the completion of the investigation, and when served by DHCR on the opposing party, will raise a rebuttable presumption that the conditions that are the subject of the complaint, answer or application exist (if the affidavit is submitted by the tenants), or do not exist (if the affidavit is submitted by the owner).