I just found an interesting thing. There is a collection of historic maps of Pittsburgh & vicinity, accessible online. One of them, dated 1915, shows a structure built on my lot, but the Allegheny County real estate portal says that my house was built in 1925. I knew there was something funny about that, because I've seen historical photos of my street that are dated earlier than that, and my house is already there.
You can find the collection of GM Hopkins Co maps here.