The house was the first to be built on a scale that could be described as a mansion in the Salt Lake Valley. It was a social center for the area, and was the scene of a meeting between Brigham Young and Governor Alfred Cumming to resolve the Utah War. The house was purchased for $20,000 by Young's oldest son, Joseph Angell Young in 1865. Young sold the house for $30,000 in 1867 to local entrepreneur William Jennings who added to the house. Jennings, believed to be the Salt Lake Valley's first millionaire, named the house Devereaux for a family property at Yardley, Birmingham in England. Jennings lived there with his wives Jane and Pricilla, who had eleven and fourteen children respectively. Jennings was appointed a calling as a general authority for the LDS church as a member of the Council of fiFITY in 1880. Jennings was visited at the house by Secretary of War William Seward and General Philip H. Sheridan in the 1860s, and by General William Tecumseh Sherman in the 1870s, whose visits implied a tolerance of Mormon polygamy in Utah by federal officials. Following Jennings' death in 1886 the house passed through several hands, and was at one time an alcohol treatment facility, the Keely Institute. At a later time it accommodated offices for a mining company. Also hosted by the Jennings, were Presidents Grant and Hayes and their wives.
The house is Victorian in character, with evidence of French-influenced detailing. It is built of brick with cement plaster overlay. A mansard roof forms the third floor. A wide porch wraps around the south and east sides. The grand house and its large yard have been preserved in the middle of the city without a perimeter fence, so the yard has the appearance of a park. William Jennings expanded and landscaped the grounds. The house is surrounded by larger and newer structures including EnergySolutions Arena, the Triad Center, and the Salt Lake City Union Pacific Station and the surrounding Gateway District development.
The interior features a large stair hall with a drawing room to the left and a library to the right. To the rear of the parlor lies a banquet room, and a dining room is behind the library. The second floor has many bedrooms, and the attic houses servants' quarters and a billiard room. The house was noted for the high quality of its woodwork and appointments.
The house was restored in the 1970s and served for a time as a wedding venue.
The mansion is also believed to be haunted.