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Rollover Mortgage is a mortgage contract, in which the unpaid balance of the contract is cyclically refinanced after every few years at the current rates for that period.
Of course, this can be good either for the borrower or for the lender, whether the rates are rising or falling relative to initial, contracted, rates. If the rates are falling, rollover mortgage will benefit the borrower, and if the rates are rising, rollover mortgage will benefit the lender.