Md. Code, Corporations and Associations § 7-205

(a) As long as it is subject to suit in this State, a foreign corporation which has registered or qualified to do business in this State shall maintain:

(1) A resident agent in this State whose name and address is certified to the Department; and

(2) An address which is certified to the Department.

(b) The Department may act as a resident agent for a foreign corporation that does business in this State:

(1) Without a resident agent; or

(2) With a resident agent who cannot be found or served with the exercise of reasonable diligence.

(c) A foreign corporation registered or qualified to do business in this State:

(1) At any time may certify to the Department the address of a principal office in this State, which may be a business office of the corporation; and

(2) With respect to an address so certified, shall certify to the Department:

(i) Any subsequent change in the address of the principal office; and

(ii) The fact that it no longer has the principal office in this State.

(d) Except as provided in subsection (e) of this section, each certification by a foreign corporation which relates to its resident agent, address, or principal office shall be executed for the corporation by its president or one of its vice–presidents.

(e) A foreign corporation and its resident agent may change the resident agent, his address, or the address of a principal office of the corporation in the same manner as provided for a Maryland corporation under § 2–108 of this article.

(f) (1) A resident agent of a foreign corporation may resign by filing with the Department a counterpart or photocopy of his signed resignation.

(2) Unless a later time is specified in the resignation, it is effective:

(i) At the time it is filed with the Department, if the corporation has appointed a successor resident agent; or

(ii) Ten days after it is filed with the Department, if the corporation has not appointed a successor resident agent.