Kevin knows it is not ideal to retire with a mortgage, but he has always rented and is now ready to buy a condo in downtown Montreal, five years before he retires. He has visited several condos and will be making an offer on December 1, 2023. To date, he has saved $15,000 for which he will use as part of the downpayment along with the maximum he can withdraw from his Registered Retirement Savings Account (RRSP) under the Home Buyer's Plan (HBP). He currently has $455,942 in his RRSP. What would be the minimum conventional mortgage Kevin could assume?