Constructed in 1910 along with the mansion, the carriage house was a utilitarian building that served as the ranch's first barn and bunkhouse while sharing many of the same Arts and Crafts design features as the mansion. Its second floor was designed as living quarters for cowboys who worked on the ranch, and its first floor served many purposes, including carriage and car storage, stables for ranch horses, and a slaughterhouse. Today it is a private residence and is not open to the public, but it still retains many signs of its original purpose, including horse rings sunk into arch posts on the front of the house, original stable windows on the west side, and a cutout on the south eave showing how hay was lifted into the hay loft. Its roof originally resembled the blacksmith's shop roof, including the large vent on top. Cowboys were offered the chance to stay on the ranch property in the carriage house, and May Lillie would wake each morning and call the bunkhouse to give the daily orders.