It shall and may be lawful to and for the landlord or landlords, where the agreement is not by deed, to recover a reasonable satisfaction for the lands, tenements, or hereditaments, held or occupied by the defendant or defendants, in an action on the case, for the use and occupation of what was so held or enjoyed; and if in evidence on the trial of such action any parol demise or any agreement (not being by deed) whereon a certain rent was reserved shall appear, the plaintiff in such action shall not therefor be nonsuited, but may make use thereof as an evidence of the quantum of the damages to be recovered.
D.C. Code § 42-3221