Liens
Bankruptcy
Vacant Homes ( must be stacked)
Divorce
Pre Foreclosure
Tax Delinquent
Probate
Older owners (stack list)
Tired landlord ( stack list)
Out of state owner ( not really a pain point)
List stacking is combining two or more categories in a list
Some other list
High equity
You can stack these lists together to further increase the number of pain points