In the US the accounting treatment of a building (depreciation) is, IIRC 40 years. So a century is considered longer than the typical lifespan. Looking around

In the US the accounting treatment of a building (depreciation) is, IIRC 40 years. So a century is considered longer than the typical lifespan. Looking around Palo Alto, there are a fair number of wood frame building ps of about a century in age, and a LOT built in the 1950s. I dont know about survivorship bias, but a century seems like a pretty reasonable assumption. (I was built in the 1960s so appreciate the thought that I might still be going strong in the 2070s, thanks!)