OK, next up is
Chicago's South Side Park (II). This was built for the Chicago entry in the Players' League in 1890, accounting for one of its alternate names ("Brotherhood Park"), and the then-Colts now-Cubs moved in after the Players' League. They did not stay long, however, as a desire to play Sunday ball while the World's Columbian Exposition (aka the World's Fair) was in town led them to build
West Side Park. The site of this ballpark is now a parking lot for the White Sox' park.
Google Drive link to South Side Park 1891
There's not much info about this park at all. It doesn't show up on any contemporary atlases, there's very little in Green Cathedrals about it save the capacity and the wall height. There's one contemporary newspaper sketch of football action in the park, and one researcher who made a drawing of its layout relative to the street grid. On the other hand, that did give me some freedom to make things a bit more convenient to model and not have to know I was being ahistorical by doing so...
I think this park gets us back to 1891 for the eight present-day NL teams that existed back then!