Here are a couple of websites with tenant rights info in Ontario, Canada:
http://www.ontariotenants.ca/law/law.phtml
http://www.canlaw.com/tenants/tenants.htm
http://www.cmhc-schl.gc.ca/en/co/reh...h/fash_009.cfm
I think that you can probably start from here and gather some useful information before going to a real estate attorney. Good luck.