https://www.openstreetmap.org/way/87109189 Street view: https://goo.gl/maps/uJiRFB2rodQJd4iQA
This location is available for large events. There seems to be some small museum space but I’m unsure of how to visit. It also houses other private businesses.
The four-story granite structure was designed by William Gibbons Preston and built beginning in 1891 and finished in 1897. Due to political unrest during the period, the building was designed to withstand mob violence. Its most prominent feature is its six-story tower. It is built in the Romanesque Revival style. The building’s staircases are built by the Guastavino system, as are some tower vaults.
The building was built to store armaments and contained a rifle range, gymnasium, and drill hall.
Over the years it has been known as Park Plaza Castle, Castle at Park Plaza, and The Tower.
Photo taken by me in early 2023.
I might have investigated more had I known I was the future mod of a castles community. ;)