Ie rent a space from the owners corporation and the funds get put back into the capital works fund? NSW if that makes a difference.
As per the post above, you can’t legally let car spaces that have been designated as visitor spots in your DA.
Firsy pass a by-law defining what your building means by “visitor” (number of hours, frequency of use, relationship with other residents etc etc)
Then just hit the buggers with Notices to Comply and apply for fines – no need to go through the Fair Trading nonsense. Straight to NCAT. Revenue from fines imposed by NCAT is paid to the owners corp.