The Diamond Ranch was established near Chugwater, Wyoming in 1878 by George Rainsford, a New York native who came west to breed horses.

His manager, Paul Raborg, bought the ranch in 1922, breeding polo ponies and raising dairy cattle.

A scheme to feed the cattle on sunflower seeds led to the construction of large silos for storage.

His former wife's parents took over the ranch, with Maud Raborg's mother Dora Mae Oberman becoming sole owner on the death of her husband in 1937.

The main barn, later the dance and dining hall, is an irregular stone structure varying from 1+1⁄2 to 2+1⁄2 stories with a mixture of hipped and gabled roofs.

The roofs are steeply pitched, lending the structures a lowered appearance that is characteristic of Rainsford's architecture.