I've noticed that many buildings built during particularly faddish architectural trends tend to very quickly become maintenance nightmares, with repairs costing

I've noticed that many buildings built during particularly faddish architectural trends tend to very quickly become maintenance nightmares, with repairs costing more than a tear-down and rebuild. It seems lots of these office buildings all over the country were built quickly, to low quality and now nobody wants to move into them. It's not just SV that has this problem. The J. Edgar Hoover Building the FBI is currently HQ'd out of is 40 years old, and by all accounts should have been razed to the ground 10-15 years ago, only slow government processes keeping the Bureau in it at all. It's expected to cost $850m-$1.1b to renovate and fix all the problems in the building and bring it up to Class A space (with inflation over time the total number would creep towards $2b). The government has decided that it would be cheaper to move the entire Bureau HQ to another site and build an entirely new building than fix this one.