In France, they obviously have a ton of old buildings, but they do tear stuff down when it comes to schools and practical matters. In the latter part of the 19th century, much of Paris was torn down, which is why it's as nice looking as it is today. (Baron Haussman). The elementary schools I've noticed appear to date from the 1950s, postwar. I don't recall seeing any really brand newish. Cities like Orlean were pretty much bombed flat in the war, they built the downtown back with new stuff that looks like the old stuff. I have not been to St. Malo but I was told the construction there is ugly, it also was bombed flat.
Places like Fontainebleau where I have stayed a number of days have postwar NSAED schools and hospitals, it was not heavily damaged in the war. The downtown area is mostly old, but the outskirts have 1950s stuff, much of which is pretty mundane or ugly. Some of the dorms were barracks when the castle was Eisenhower's HQ and after when NATO was starting up.
In smaller towns not flattened, I'd say the downtown area is old, the outter ring is newer stuff, often not very appealing looking.
Folks don't often realize how much we bombed France, places like Caen, Orlean, Rouen, rail intersections and the like, St. Lo, St. Malo, ... Bayeux was not destroyed or fought over despite being 5 miles from Omaha Beach.