I had a 300G (total water volume) system in my condo for a year or so. I would say the size isn't the problem but having the space for proper equipment and maintenance is.
My strata by laws don't say anything about fish or aquariums at all. Just 2 pets per condo. The aquarium counts as one. We have 4 pets in that case which is pretty normal for our building...I know a few people have 3 dogs and strata doesn't care at all. Someone above me has a 250G freshwater. Strata knows about it...he's on the board actually. He said they just wanted to know about his insurance.
Building is 10" thick concrete floors and all concrete walls between all the units, so you can't hear a thing other than in the hallway (through the front door).
I don't think its easy to find a building with the concrete walls but I leaked about 80G of water onto our floors last year from my RO unit and not a drop went through to anyone elses place. Water just pools up and stays on our floors.
Good luck.
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