Using Google Streetview for his address, it appears they were living above their business.
Name: Robert Walker Howie
Birth Date: 21 Dec 1883 [I read 26 Dec 1883]
Birth Place: Chicago, Illinois
Residence: 5829 W. Madison Street, (Chicago,) Cook County, Illinois
Race: White
Age: 59 (Dec 26, 1883)
Occupation: Owner - Marvel Carbureter (sic) Sales & Service - same address
Nearest Relative: Elvera A Howie - same address
Height/Build: 5' 7 1/2" / 110 lbs - Ruddy complexion
Color of Eyes/Hair: Blue / Grey