https://en.wikipedia.org/wiki/Mutual_of_Omaha_Headquarters_Tower
https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Omaha#Tallest_habitable_buildings
https://en.wikipedia.org/wiki/WoodmenLife_Tower It wasn't until 1977 that a building in Vancouver was allowed to rival it.
"Construction of the building began in 1966 and was completed in the spring of 1969. At its completion, the 478-foot (146 m), 30-story tower was the tallest building in the state of Nebraska, overtaking the Nebraska State Capitol." https://en.wikipedia.org/wiki/WoodmenLife_Tower#Description