35 East Wacker, also known as the Jewelers' Building, is a 40-story 159.4 m historic building in the Loop community area of Chicago, Illinois, United States, located at the intersections of Wabash Avenue, and facing the Chicago River. It was built from 1925 to 1927, and was co-designed by Joachim G. Giaver and Frederick P. Dinkelberg. It was once considered to be the tallest building in the world outside of New York City.