In NSW, a company does not “own the strata”. Your brother’s townhouse is one lot in a strata plan. The owners of each lot form a company called the owners corporation.
In a build-to-rent scheme, the company does “own” the strata and it may not be a strata scheme at all (although it would be if they wanted the option to sell individual properties in the future). Classic examples of this are where the builder-developer wants a penthouse with a view so builds enough apartments underneath to achieve their lofty ambitions.