Up until recently I worked in schools IT and we did a shit load of work on major network refits and came across so many buildings that just needed condemning. And asbestos. So much asbestos.

A lot of schools standing today were built cheaply and fairly carelessly during the baby boom of the late 50s and 60s and were only expected to stand for 30 years. These should have been pulled down and rebuilt by the turn of the millennium (and, in fairness, many were, especially in the early 2000s) but a lot are still standing. Why spend £10m building a new school when you can keep the old one open for £2m/year in extra maintenance costs?