Taking into consideration the building supplies that were available in that time period for that particular geographic area (say, a major metropolitan city in the mid-western United States), do homes built in the late 1800s have definite points in time that they reach where they are essentially beyond repair without a complete teardown? I'm not really talking about things that can be replaced like legacy iron piping with contemporary copper...I'm talking about the lifespan of the actual bricks and wood that go into the foundation/frame of the house itself deteriorating to the point that the house becomes structurally unsafe?
Is this a real problem? Or were the supplies used even in the late 1800s treated well to such a degree that, given typical housing standards (at that time) if it were properly built, should last for hundreds of years?