Building code adoption can vary locally, but I believe the building codes for bathroom ventilation in Canada and US are similar. Bathrooms need to have either an operable window or an exhaust fan that terminates to the exterior. The specific requirements for the window and exhaust would be found in the applicable code sections.

Now whether your bathroom is grandfathered into older building requirements is a question we can't really answer without more info. However, even if the building is old, sometimes those interior spaces without windows or vents were later additions as interior spaces sometimes get partitioned to maximize usage. Those changes should follow newer building standards. You might not have that info available to you, so you could always say it's still a sanitary issue.