This is true. It’s probably 2-3 times as long as a GPU chip. But it’s still probably half or a quarter of the depreciation timeline of a carrier fiber line.
Even if the building itself is condemnable, what it took to build it out is still valuable.
To give a different example, right now, some of the most prized sites for renewable energy are former coal plant sites, because they already have big fat transmission lines ready to go. Yesterday's industrial parks are now today's gentrifying urban districts, and so on.