Your by-law demanding compliance with the DA for the building should be enough. Your challenge is to prove that the visitors are holiday rentals.
Strategically placed cameras on common property should gather the evidence you need and but you can start issuing Notices To Comply as soon as you are sure short-term letting is occurring.
Our friends BnbGuard will help with the evidence gathering.
Regarding the cancelling of swipe cards, what I would do is send out a notice to all owners that they are required by law to register the names of their tenants (under Section 258 of the strata Act), subject to a maximum fine of $550. Fourteen days after you issue the notice, you announce an “audit” of all swipe cards, citing concerns about security breaches.
This audit will require the registered tenant to present their swipe card and 100 points worth of identification, to the building manager, strata manager or secretary on a certain date. After that, you could just cancel the cards and say unknown people had been seen entering the building and the cards were cancelled as part of a follow-up to the security audit.
Be ready for very angry holidaymakers who can’t get into the building and homicidal holiday rental “hosts” who will soon be losing money hand over fist. But if you hit them hard with every option available to you, they’ll soon get the message and go elsewhere.
But call Bnbguard – they are the experts in this.