There's obviously a flaw in the design or construction of that complex. I'm sure "corporate" realizes that and they have determined that it's cheaper to pay the HVAC and drywall guys to come out every few months. Give it a few more months and AC season will be over and you'll be free of the problem for the fall and winter.
If I was in your position, I'd rip the damaged plaster out and hang a 5 gallon bucket up there. The drain on the AC unit is probably backing up, or the pump is going out/insufficient. It sounds like the leak is predictable and always in the same spot. Just hang that bucket and call it a day. Empty the bucket once a week in the summer and save your M3 from any damage.
Run your lease out and GTFO of there!
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