Claim: Iowa State Capitol, a 275 ft. high building, was the tallest building in Iowa from 1884 to 1924; then from 1991 up to the present, 801 Grand, which is 630 ft. high with 45 floors, holds the title.
Evidence: 1884–1924 Iowa State Capitol 275 (84) 1 801 Grand (previously The Principal Building) 630 (192) 45 1991