This is a good example of the Double-Decker style of apartment house. “Flats” like these became especially popular after about 1910 as a way to increase income from rental properties, but also to provide good housing for single professional workers and small families. These houses are easy to recognize. There are usually two doorways from the front porch, but also the window patterns of each floor or nearly identical, indicating the similarity of the apartment plans.
These houses often did not have garages, since residents used the streetcars, which were at their maximum extent and efficiency at the time, for transportation, so houses like these are often called “Trolley houses.” Sometimes the owner of the building would live in one unit and rent the other, or sometimes two generations of a family would occupy the two apartments in one house.