Maryland Tax - Property Section 7-234
§ 7-234.
  Property is not subject to property tax if the property:
    (1)   is owned by:
      (i)   a national organization of veterans of the United States armed services; or
      (ii)   any department, State or local unit, chapter, branch, or post of a national organization of veterans of the United States armed services, including:
        1.   the 29th Division Association of World War I; or
        2.   the Society of the Cincinnati of Maryland; and
    (2)   is necessary for and actually used exclusively for the purposes of any of these organizations.