My father years ago saw a house near Detroit City Airport that was only being held up by it’s basement window frames. They exist. There’s absolutely close to nothing salvageable or restorable down there. I know, I grew up there, and have been a carpenter, and a plumber/electrician for over twenty years.
My father also owned a nine unit townhouse building constructed in the late 1920’s on Gratiot and Seneca near Indian Village. It had a length of six single car garages with it there. The place had turrets and spires in the manner of a French Chateau when it was built. Through years of housing generations of welfare recipients and extended families, it deteriorated into a nonhabitable state. After the thieves stole anything of value, including the wonderful weathervane of a gentleman in tails wielding a telescope looking into the distance, they stole the bricks off of the Gratiot side of the building. That’s Detroit for you.