I'm a Brit too, but historic doesn't have to mean "old". It means "important in history". Nine Eleven was a historic event. Now if they'd written "historical", that would be a different matter. (Someone should tell the BBC this -- they're constantly mixing up the meanings of both words.)
In this case it wasn't that old (1916) nor historic (unless you count HP beer bash parties as historic). However, the building is an interesting contrast to the new building, and nice they decided to keep it.