"Pittsburgh" seems an odd name for a church!
More seriously, "crkva" is not a likely word on a Greek-Catholic Church.
Haven't been to Pittsburgh since 1988, and have no expectation of going there again, so I can't go look at the building. It is probable, though, that in 1901 or 1902 the Latin Diocese of Pittsburgh would have been aware of this building and listed it somewhere. If the Latin Diocese of Pittsburgh these days have an archivist, he might well be able to shed some light on the history of the building.
Fr. Serge