(a) When in case of a lease of real property and the failure of the tenant to pay rent, the landlord has a subsisting right to reenter for such a failure, and may bring action to recover the possession of such property, and such action is equivalent to a demand of the rent and a reentry upon the property.
(b) The provisions of this section are suspended during the effective period of subchapter III of chapter 31 of this title, relating to rent control, and this section shall take effect upon the termination of such subchapter as provided in section 846 of this title.