The Securities Building was built in 1917 by William Maines, Sr., who was a prominent banker at the time.  Rumored to include competitor and Billings founding father P. B. Moss as a silent investor, the basement of the building once included a large concrete vault that was built to house “paper securities”, such as original stock certificates, notes, and bonds – hence the name.  In the Spring of 2003, Walkers Grill restaurant, a longtime Billings favorite, purchased the building and began the complete restoration of the five-story structure to its original condition.