Is an agreement to purchase an apartment by paying part of the amount and borrowing the remainder from a friend, with the apartment's rent going to him throughout the loan repayment period as a form of partial loan repayment, considered usury (riba)?

The question posed by the inquirer could be interpreted in two ways: Either the rent is calculated against the lender from the debt amount, which is permissible because it falls under the category of a goodly loan (qard hasan (definition)) and aiding a Muslim. Or the rent is not calculated, and it is a reward for the lender, which is forbidden usury (riba); based on the Prophet's (peace be upon him) saying: "Every loan that draws a benefit is usury."