When: Spring or Summer of 1952.
Where: Ann Arbor, MI. The auction listing gave me almost that much, being advertised as a shot of the University of Michigan Hospital. Given that much, finding the location was not too involved, as there was enough information online between Google searches and perusal of Historic Aerials to pinpoint the location of the shot. The hospital was replaced by a newer structure to the distant right in the 1970's, so the location of this shot now looks much more suburban, as the compact nature of the scene is gone, with the site now occupied by a cardiovascular center.
Who: Despite the infrastructure and accessories to suggest a potentially busy scene, I can't see a single soul in this scene.
How (much): Picked up for $4.99 on ebay.