Mysterious vanishing homes
Here is the thing... isn't the real question here why someone showing up to demolish a home never considers the question "this does not look right, maybe I will check if this house should come down?".
They don't because, in a complete veil of ignorance* way, it probably seems quite logical to tear down the homes in question. That says a whole lot.
I suspect if we parse the numbers, the city of Pittsburgh has pretty much the oldest housing stock in the nation... if you exclude Jamestown of course and maybe a few old places in New England. I bet the places that might have older housing stock have had a tad more investment in them to keep them up.. or were better built in the first place. So if someone were to compute a 'real age' metric for housing, how far off the chart would we be I wonder?
*Note that is not a pejorative, but a philosphical context.