You must have taxable compensation to contribute to an IRA. Passive income from rental real estate is not taxable compensation. See this IRS website for IRA contributions - https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-ira-contribution-li...
And IRS Publication 590-A for compensation - https://www.irs.gov/publications/p590a/ch01.html#en_US_2016_publink1000230355
