WHAT ARE SOME RED FLAGS ON LISTINGS THAT USUALLY ONLY A REAL ESTATE AGEN...

When the listing does not allow FHA financing or want cash only.

That means there are issues a lender will not allow in a loan.  Watch out for estate sales, dirt roads, clouded titles/quiet titles, community wells, easements, shared septic systems and mobile homes that have add-on structures.  All of these can cause mortgage issues for the person you want to sell it to.