BRIEF-Canada regulator considering changes to mortgage guidelines
July 7 (Reuters) -
* Canada's bank regulator says considering changes to mortgage underwriting guidelines
* Canada Regulator - Borrowers relying on income sources outside of canada pose particular challenge for lenders
* Canada regulator says limits for downpayments on higher risk mortgages need to be revisited
* Canada regulator says some institutions 'not as proactive' as others to ensure prudent mortgage lending (Reporting by Matt Scuffham)
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