Mayo to build 11-story research center in downtown Rochester Mayo Clinic announced April 27 that seven floors are being added to the Anna-Maria and Stephen Kellen Building, being built in Rochester. The 11-story building is being funded primarily by donations, led by a gift of $49.3 million from the New York-based Anna-Maria and Stephen Kellen Foundation. Written By: Forum News Service | 12:12 pm, Apr. 27, 2021 × Mayo Clinic announced today that seven floors are being added to the Anna-Maria and Stephen Kellen Building, being built on the corner of Third Street Southwest and Fourth Avenue Southwest. The 11-story building is being funded primarily by donations, led by a gift of $49.3 million from the New York-based Anna-Maria and Stephen Kellen Foundation.Submitted by Mayo Clinic