The Broadway Department Store was located at 222-224 Broadway. This was also the Knights of Columbus Building. You can see their name on thebuilding in the upper center. I assume they met in the upper floors and leased the ground floor to the department store.
The first Knights of Columbus council in North Dakota was formed on May 30, 1903Fargo Council #782.
I don't know when this real photo postcard was photographed. A Fargo 1923 telephone book book does not list a "Broadway Department Store" but the "Knights of Columbus Hall" is given an address of 322-324 Broadway.
I am not sure if the building exists today.

Fargo, North Dakota
Broadway Department Store