The building is a 6 story masonry building with residential units on floors 2-6, and commercial office units on ground floor and basement. 622 W. Randolph building was built sometime in the 1970-80 with masonry walls and open web steel joists with metal deck and concrete slab. The attached adjacent building 626 W. Randolph was built in the 1920s and is a masonry building with a wood heavy timber structure.