In about 2010 they constructed a new building at Kinloss, housing the new MRA4 simulator - so I presume this counts as a "modern" structure?
Within a couple of years the roof had blown off (peeled back) in a storm that had no real impact on the "old" structures.
I'm not sure what condition these modern structures will be in 50 years from now, but personally I have my doubts. Not that I'll be around to see...