I imagine most of bldg's have been built between the 40s and 60s, built huge to support its members now dwindling away every year, expensive maintenance and heating costs that are through the roof.
Sadly Salmon Arm got rid of theirs for reasons above, it had a lovely commercial kitchen and banquet hall up stairs; that as a kid, the cadet corps would hold the annual mess dinner from, but because they switched to a one story design (kitchen was poorly set up, had all residential appliances/counter tops/half the space) and no banquet hall, meaning the bar wasn't separate, so no minors meaning here we are doing the annual mess dinner in a church basement, the people were all probably very nice but it wasn't the same.