The Buder and Guaranty buildings in downtown St. Louis. These buildings have since been torn down. A postcard view of the Buder building can be found here on the outstanding Built St. Louis site.
The building you see peeking between the two is the Civil Courts Building.
The parking lot between 6th and 7th streets can be inferred from the top of what looks like a Volkswagen, just visible over the edge of the fountain. This parking lot has been removed and the space used to expand Kiener Plaza with a particularly sterile concrete amphitheater.