Other than a paging frequency for the site, I see no other published listings in TAFL. Do you know which security company is contracted to do security?
Use this online tool to search for frequencies, locations, or licensees. Infomation comes from Industry Canada's database of frequency allocations.
tafl.mckie.ca
In many cases, Paladin Security patrols hospitals. Set your scanner to Search between 450-470 MHz. If the right person reads this post, you may get your definite answer.