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CHICAGO — Lessen, a tech-enabled solution for outsourced real estate property services, has opened its new 76,932-square-foot office at 203 North LaSalle Street in downtown Chicago. The 17-story building is situated in the city’s Central Loop tech district adjacent to Google’s forthcoming Chicago office in the Thompson Center. Lessen first entered the Chicago market in 2023 after its acquisition of technology company SMS Assist for $950 million, the largest proptech merger in U.S. history, according to the company. Lessen partners with residential and commercial owners and occupiers who collectively manage over 1 million locations.