|Completed and first occupied in 1931, the Des Moines Building is significant, locally and under National Register Criterion C, because of its architectural style. The building's massing, upper floor setbacks, and main lobby call attention to the influence of Art Deco styling on its design. The Des Moines Building is significant because of its architectural form as a skyscraper. It added a key component to the Sixth A venue Canyon, one of the densest and most fully developed urban spaces in Iowa. The Des Moines Building also calls attention to Proudfoot, Rawson, Souers & Thomas, a venerable Des Moines-based architectural firm, which designed the building and demonstrated in it the ability to adapt to new architectural ideas .