That skinny building rising along the left side of the photo:

http://www.shorpy.com/node/69?size=_original

Is the Mather Tower, built by Alonzo Mather's Mather Stock Car Co. just before the stock market crashed. It is distinctive as one of the most slender buildings in the city; the top floor is only 280 sq. ft. Read more:

http://en.wikipedia.org/wiki/Mather_Tower

Dennis