Union Park - Oriole Park III

https://www.hmdb.org/m.asp?m=267624

Union Park Historical Marker This is the former site of Union Park, also known as Oriole Park III and Baltimore Baseball & Exhibition Grounds. (A historical marker located in Baltimore in Baltimore, Maryland.)

Sanborn Insurance Map of Union Park

Union Park, home to the Orioles in the 1800s, finally gets recognition A wall plaque is now on the side of an East 25th home near Guilford Avenue, marking an overlooked chapter in Baltimore Orioles history.

https://deadballbaseball.com/2012/02/union-park-home-of-the-world-champion-national-league-baltimore-orioles/

Union Park – Home of the World Champion National League Baltimore Orioles - Deadball Baseball Union Park lasted as a major league venue for a mere nine seasons, from 1891 to 1899. Known also as Oriole Park (III) and the Baltimore Baseball and