Libby Lumber Company, with home offices in Minneapolis, Minnesota, had its principal place of business in Libby, Montana. The firm was incorporated as a retail outlet. In 1916 Libby Lumber Company sold its property to Libby Yards Company which was incorporated to sell merchandise, property, and real estate,, and to operate a general manufacturing and contracting business. Libby Yards had retail operations in many Montana communities including Madoc, East Scobey, Antelope, Froid, Plentywood, Gilman, Great Falls, Kevin, Beaverton, Scobey, Shelby, Brady, Big Sandy, Conrad, Valier, Redstone, Sunburst, Cut Bank, Glendive, Homestead, and Saco.

In 1921 Monarch Lumber Company took over the preferred stock of Libby Yards Company. Monarch Lumber Company was incorporated in the state of Delaware listing its principal place of business in Great Falls, Montana. The first meeting of the company's board of directors was held in 1921 in Minneapolis.

Building Service, Inc. was formed in 1933 at the first meeting of its board of directors in Great Falls. At that meeting it was determined that Building Service, Inc. would purchase stock "now owned or controlled by the Monarch Lumber Company and used in the conduct of its wholesale business," thus becoming the wholesale outlet for Monarch Lumber Company. The main warehouse for Building Service, Inc. was in Great Falls. Employees for the company included Russell (Ben) Wallace, manager; G.H. Rogers and P.V. Eames, presidents in the Minneapolis office; Roy Forney and Gordon F. Mick, managers of the Billings branch warehouse; and F.D. Wilson, assistant treasurer in Great Falls. Building Service, Inc. was liquidated in 1961 when the company sold all its assets to the Boise Cascade Corporation.