In the middle of the 1960s, personal-injury attorney Keith E. Roberts Sr. left Henslee, Monek & Henslee in downtown Chicago and opened his own shop in his hometown of Naperville. His son, Keith E. Roberts Jr., now a partner at Roberts P.C. in Wheaton, remembers the first time he saw his father’s new office. There was no elevator, and since the boy was only 10, the 30 steps he had to climb with his father seemed particularly grueling. When he reached the cramped, sparsely decorated office, he was confused …