 In 1956, at the age of 31, he began his real estate career, taking a job as a broker with Chicago real estate magnate Arthur Rubloff.At Arthur Rubloff & Co., Miglin would first get involved with warehouse construction, later moving into office development.One of the projects he was involved in was the development of the first two of the three towers at the President's Plaza office complex near Chicago's O'Hare International Airport (he would later develop the third tower in 1985 with his firm Miglin-Beitler).