(a) The filing of a PAR against an order, other than an order adjusting, fixing or establishing a maximum rent, within 33 days after the date of the issuance of such order, shall stay such order until the final determination of the PAR by the administrator. However, nothing herein contained shall limit the administrator from granting or vacating a stay under appropriate circumstances. Where the PAR is against an order granting a certificate of eviction, it shall stay such order as herein provided, regardless of whether the waiting period provided in the order has already expired.

(b) The commencement of a proceeding by the administrator to revoke or cancel an order granting a certificate of eviction shall stay such order until the final determination of the proceeding, regardless of whether the waiting period in the order has already expired.