(b) If all the occupants abandon the dwelling unit, the landlord may send notice to each occupant at his last-known address both by regular mail, postage prepaid, and by certified mail, return receipt requested, stating that (1) he has reason to believe that the occupant has abandoned the dwelling unit, (2) he intends to reenter and take possession of the dwelling unit unless the occupant contacts him within ten days of receipt of the notice, (3) if the occupant does not contact him, he intends to remove any possessions and personal effects remaining in the premises and to rerent the premises, and (4) if the occupant does not reclaim such possessions and personal effects within thirty days after the notice, they will be disposed of as permitted by this section. The notice shall be in clear and simple language and shall include a telephone number and a mailing address at which the landlord can be contacted. If the notices are returned as undeliverable, or the occupant fails to contact the landlord within ten days of the receipt of the notice, the landlord may reenter and take possession of the dwelling unit, at which time any rental agreement or lease still in effect shall be deemed to be terminated.