I think you're right Zooker. They were built to last back then.
As I said earlier, I hope the LBA Tower lasts for a good long time yet. It's a quite distinctive building and deserves to be around for a while yet. I suppose it could potentially be under threat from any plan to demolish the existing terminal (of which the Tower is a part) and airport development generally. For obvious reasons, any successor had better not be too tall (unless Ground Radar finally arrives).