Excellent find
Flyingwedge! I don't remember seeing the Excelsior Laundry building before.
Your 1907 photograph shows a gigantic flagpole attached to the corner of the building. By 1933 it's been replaced by a blade sign (it's rather hard to see), & at the corner on the roof you can see the old attachment that secured the flagpole. Also, in your 1933 close-up, you can see where the building has been seismic retrofitted (that was fast...since the earthquake occurred in 1933).
Here's FW's original post if you want to see what I'm blabbing about.
http://forum.skyscraperpage.com/show...ostcount=20199
Anyway, good job
FW.