Should I file as rental, installment sale, or investment on second property?

Purchased 7/2017 for son in law until he could get loan by himself in 2018.  Bought and set up on contract with him for my protection, a residential land contract.  He decided he wanted out of contract in Dec and signed deed back over to me in Jan.  He paid me $350 a month, which paid property taxes, homeowners insurance, and rest to principle and interest on my loan.  So I made no profit.  For 2017 tax year, how do I file this?