Financing through rental income and nothing else?

[Hen Ley]

Looking to finance a purchase- it will either be a flip or rental.  Currently don't have any income and my tax returns don't offer anything that would help qualify.  Having a hard time finding a lender that will lend based solely on anticipated rental income for this property (which already has a tenant in place I could keep).  Have a great credit score, no debt, a history of managing/owning rental properties, able to put 40% down and still have a few years living expenses liquid.  Hoping to avoid hard money lenders- Any suggestions as to other viable lending sources?