From Terry Salmans, who discovered this amazing image at the Library of Congress digital image archive, is the headquarters building of the Pacific Electric, circa 1910-1911. Taken by the Detroit Publishing Company for their line of postcards, the original image has a number of fascinating features, cited here by Terry:
Interesting is the PE 500 class car pulling into 6th and Main Station. In the lower left on Sixth St. a Arcade Depot - Edendale Local Line trolley is loading passengers. The car 928, a brand new Huntington Standard will be renumbered in a year or two into new PE 216. In 1912 the car is sold off to the Portland, Eugene & Eastern Rwy., another Southern Pacific subsidiary. Also notice the man on the stool next to traffic cop. I think that he might be a line inspector for the PE or LARY.
Library of Congress Collection