Just so we're clear, there's a difference between transient housing and living quarters. For living quarters, Alyssa would probably the better person to ask, but for transient quarters, where I spent most of my experience, because I never lived in the PMQs, yes, absolutely, these buildings are falling apart.
I can think of P-50 in Petawawa as a prime example. That's where I did my first leadership course in 2002. That building, 20 years ago, was falling apart. Utilities were falling off the side of the building, brickwork was falling, paint was peeling and there was talk of lead paint and asbestos in the building. Right now, 20 years later, that building is still in use.