The Mariner consists of a converted ten-story brick warehouse building plus a six-story connected annex occupying a marvelous location at the edge of Boston Harbor with sweeping views across the harbor and out to sea. The building was converted from commercial to residential use in 1986. At that time, it was outfitted with a three-story lobby, consisting of a floor at street level, a concierge/reception desk located above street level at the top of a flight of stairs and a mechanical lift, and a soaring vaulted atrium roof high above.