Maryland Code, Corporations and Associations § 12-302

(b)(1) Neither an obligation of a beneficial owner or trustee of a statutory trust to the statutory trust arising under the governing instrument or a separate agreement in writing, or a note, instrument, or other writing evidencing any such obligation of a beneficial owner or trustee, shall be subject to the defense of usury.

(2) A beneficial owner or trustee may not interpose the defense of usury with respect to any obligation identified in paragraph (1) of this subsection in any action.