Md. Code, Real Property § 11–119

A person may bring suit against the council of unit owners, or against the condominium unit owners as a whole in any cause relating to the common elements, by service as follows:

(1) If the council of unit owners is a corporation, in the same manner as the Maryland Rules authorize service on a corporation; or

(2) If the council of unit owners is not a corporation, in the same manner as the Maryland Rules authorize service on an unincorporated association.