I wonder if you have already allowed this commercial tenant to get away with too much. Yet again I find myself recommending you consult a specialist strata lawyer. I don’t know if their “medical precinct” leeway will stretch to a predominantly residential building. Either way, I think you need to sit down now and discuss all the breaches you think they have committed and then at the very least have them ready for your hearing (although it may not mean much if you haven’t presented them with the complaints)