Just to add to scotlandx’s answer, I would imagine there are possible OHS consequences and responsibilities that the Owner’s Corporation need to be aware of.
See https://www.workcover.nsw.gov.au/newlegislation2012/Pages/strata-title-body-corporate.aspx
Allowing a hairdressing business to be conducted, even in a garage, has to be close to getting the whole strata lumped with extra responsibilities imho.