Del. Code tit. 25 § 2606
The affidavit and notice of Broker's Lien shall state the name of the Broker claiming the Broker's Lien, the name of the record owner of the commercial real estate that is the subject of the Broker's Lien as stated in the Brokerage Agreement, the name of the tenant if the lien is upon the leasehold estate of the tenant, a description of the commercial real estate upon which the Broker's Lien is being claimed, the amount or method of computing the compensation for which the Broker's Lien is claimed, the real estate license number of the Broker claiming the Broker's Lien, the names of the parties to the Brokerage Agreement, and the date of the Brokerage Agreement. The affidavit and notice of Broker's Lien shall contain a sworn statement of the person signing before a notary public that the information contained in the notice of lien is true and correct. In the event of any lien claimed against a leasehold estate of a tenant, the Broker who placed the lien shall within 10 days serve a copy of the affidavit and notice of Broker's Lien upon the landlord of such tenant by certified mail, return receipt requested, or process server, however, the lien against the leasehold estate of a tenant shall not be a lien against the landlord's interest in the property.
25 Del. C. § 2606