So since I'm a nerd, I checked out the other houses
The house just to the left of the Colgrove Apartments which was built with a 2 story extension right to the alley, was owned and occupied by Mr Colgrove who built the brick apartments,
for a couple of years before and after the apartments were built. So I'm not sure if he used it as offices for the build or what, but after he moved out it was occupied by 2 people
for a while, one in the front and one in the back attachment. By 1920 that had turned into 4 suites, then 6 by 1925, then 7 after 1930, and by then it had been named the "Lyndell Apartments.
The house to the left of that one from 1910 until the late 30s was the "Salvation Army Citadel Officer's Quarters". It is a mirror image to the Colgrove house so maybe Colgrove built it too.
By 1940 it had been turned into 4 suites and named the Donna Lew apartments.