Duart Hall is a large and picturesque Italianate building in Rothesay. Its large massing features a hipped roof with a central cross-gable and a wide columned veranda. The building's most notable feature is its large square cupola with arched windows through which the Kennebecasis River can be clearly seen. Supposedly, this structure was originally used as an air vent.

The Duart Hall's history is linked with that of the adjacent Belleview Hotel. Originally, Duart Hall was used as a carriage house for the hotel's guests. In around 1900, it was modified to serve as a second hotel. A number of carvings and signatures made by former residents around this time can be found in the building. Among those signatures is that of Lieutenant Governor the Honorable William Pugsley, who in 1915 purchased both this building and the Belleview Hotel, which he turned into his own private residences. Following Pugsley's death in 1925, the residence was acquired by the Maclean family clan from Scotland. They gave the building its current name, with the word "Duart" coming from Duart Castle in the isle of Mull in Scotland, which was the ancestral home of the Clan Maclean.