This is a change of use issue and there are all sorts of restrictions on that, both (potentially) at the level of strata rules and council planning.
My first thought would be to check your rules (by-laws) about keeping animals and/or running businesses.
If you have no specific rules on these issues, the “model” by-laws apply.
Also there are insurance issues to consider as your block may well not be covered.
And I’m pretty sure the local council will have a view too.
And, just putting my common sense hat on for a second, your secretary or strata manager should be writing to this person saying this business is entirely inappropriate for a block of units.