What is the ruling on mortgaging a house for $7,0 for one year, with a monthly payment of $60, and paying for water and electricity bills, and committing to maintaining the house and repairing any damage that occurs to it, without retaining the ownership deed, but only a copy of the mortgage contract?

The amount paid is not a mortgage, but rather a loan that brings benefit. This is because paying 7,0 dollars to the homeowner in exchange for renting it at a low price, and then reclaiming the amount, is a loan that results in a benefit. And every loan that brings a benefit is usury (riba), which is prohibited by the consensus of jurists.