Jeff's photo is the building on the NE corner of 20th and Howard.
At first I thought it was a fire station, but apparently it has the initials NPCO
so maybe it is the Nebraska Power Co:
and a cool alarm:
edit: I just did a quick search and the Nebraska Power Co of Omaha (est. 1917)
was the last privately owned electric utility in Nebraska.
I believe electric utilities were made Public in 1945, so this building would pre-date 1945.
And DTO, yes my picture is from N 24th,
but can you name the building and its historical significance?