Maryland Code, Real Property § 14-308

(b)(1) The right to enforce any broker's lien under this subtitle expires at the end of 1 year from the day on which the petition to establish the broker's lien was first filed.

(2) During the 1-year period the claimant may file a petition in the broker's lien proceedings to enforce the lien or to execute on any bond given to obtain a release of the lien property from the broker's lien.

(3) If a petition to enforce the lien is filed within the 1-year period, the right to a broker's lien or the broker's lien, or any bond given to obtain a release of the broker's lien, shall remain in full force and effect until the conclusion of the enforcement proceedings and after the conclusion of the enforcement proceedings in accordance with the decree entered in the case.