Choi opened Keller Williams OneChicago in 2017 with his business partner Josh Weinberg, after a decade of success as the Weinberg Choi Residential Team. KW OneChicago now has nearly 375 agents who do $1.2 billion in annual sales. He is also president of Illinois Realtors, which has over 50,000 Realtor members. In 2018, he served as the president of the Chicago Association of Realtors.