I have seen the Compton and Dry pictorial St. Louis used for a variety of historical purposes, but I have yet to see a full comparison of the pictorial St. Louis in 1875 with what remains today. Each day a new plate will appear in the order of their appearance in the Compton and Dry map, followed by an edited version in which the remaining buildings (as far as I can tell) are highlighted in blue. All images are from the Library of Congress downloadable map.
Surviving buildings from Plate #21:
• 923 Locust St. (commercial)
• 815 Olive St. (Old Post Office)
• 11 N. 4th St. (Old St. Louis County Courthouse)
• 555 Washington Ave. (May Co. Building)
Remaining buildings from Plate #21:
For more information on 923 Locust St., see: