Maryland Code, Real Property § 8-806

(a)(1) In any suit, action, or proceeding by a ground lease holder, or the transferee of the reversion in property subject to a ground lease, to recover past due ground rent, the ground lease holder, or the transferee of the reversion is entitled to demand or recover not more than 3 years' past due ground rent, calculated from the date notice was sent under § 8-807(c)(1) of this subtitle.

(2) Notwithstanding any other provision of law, a ground lease holder may not bring any suit, action, or proceeding against the current leasehold tenant or a former leasehold tenant to recover the ground rent that was due and owing before the date the current leasehold tenant acquired title to the leasehold interest if the ground lease was not registered in accordance with Subtitle 7 of this title before the date the current leasehold tenant acquired title.

(c)(1) Notwithstanding any other provision of law, in any suit, action, or proceeding to recover past due ground rent, a ground lease holder may only recover not more than 3 years' past due ground rent, calculated from the date notice was sent under § 8-807(c)(1) of this subtitle, if the property is:

(2) Notwithstanding any other provision of law, a ground lease holder may not bring any suit, action, or proceeding against the current leasehold tenant to recover the ground rent that was due and owing from a former leasehold tenant before the date that the current leasehold tenant acquired title, if the property is:

(3) With regard to property described under paragraphs (1) and (2) of this subsection, a ground lease holder may request in writing that the current leasehold tenant acquire the reversionary interest under the ground lease for the market value established at the time of the acquisition by the current leasehold tenant under the ground lease.