Maybe is probably the answer. I suspect that the Alewife garage isn't exempt from the T's history of deferred maintenance, since it was increasingly decrepit by 2015, but it's actually not that old. It opened in what, 1985?
Full repair history:
2007, $1.4M structural & concrete repairs
2012, $2.9M structural & concrete repairs, drainage and skylights
2015, $5M project structural repairs contract completed. (Per the beacon; likely change orders to the above 2012 contract to expand scope given the 36 month timeline. I Can't find the actual mbta contract, however)
2018, $5.7M structural & concrete repairs
2021, $3.2M structural & concrete repairs
2021, $7.2M replacements of fire alarm system, busway ventilation, emergency lighting, defective plumbing including sprinkler risers and piping.
2024, $8M structural & concrete repairs, contract ends 2027.
But over the past 20 years of repairs completed and envisaged, that works out to about $1.5m annually, not including the atrium repairs which weren't to be anticipated. That latest contract is over the next 3 years, so it's about $2.7m a year. Given depressed ridership, it may just barely break even, but costs are clearly escalating.