Maryland Code, Real Property § 9-105

(i) The name and address of the petitioner;

(ii) The name and address of the owner;

(iii) The nature or kind of work done or the kind and amount of materials furnished, the time when the work was done or the materials furnished, the name of the person for whom the work was done or to whom the materials were furnished, and the amount or sum claimed to be due, less any credit recognized by the petitioner;

(iv) A description of the land, including a statement whether part of the land is located in another county, and a description adequate to identify the building; and

(v) If the petitioner is a subcontractor, facts showing that the notice required under § 9-104 of this subtitle was properly mailed or served upon the owner, or, if so authorized, posted on the building. If the lien is sought to be established against two or more buildings on separate lots or parcels of land owned by the same person, the lien will be postponed to other mechanics' liens unless the petitioner designates the amount he claims is due him on each building;