Dan-
Union League to be time period specific, 18th hole as David figured out as well. I saw this same photo some years ago on EBAY, but there was no name attached for the photographer! If you click on the tag for Helin you will see some other photos taken by him, interesting that they don't have some of his other golf photos. I have another photo taken from the same collection that shows the 18th hole at Meadow Club from late 1927-8 with Robert Hunter of all people!! Guy i dealt with via emails didn't have a lot of info to pass along, he just pulled out some of the auto adverts that had golf courses in the background. Should be more!
Will have to look into finding more of his photos as the Auto and golf were closely connected in the 1920s.
Thanks for posting this!!
Sean