I am careful to do all disclosures because lead is a serious inhalation and ingestion hazard (think children), Asbestos is handled the same way.

No problem investing in student housing for children, this is commonly done.

I believe you can ask them to move even with rent control in place IF the new owner or a directly family member (Spouse, Mother, Father, Children) want to move into the unit.

I got ownership of a property (I got the deed and agreed to pay the seller a mortgage) and opened it to women with children in need of housing.

I only had the oppty to meet and speak with one of the prospective tenants, so before running the credt/background checks, I 'invited' the prospective to bring the other tenants (children) to view the house and that we wanted to meet them.

This may be married couples, live-in couples or parents with adult children. 

Perfect for my children.

They will not accept things such as paper diapers, sanitary napkins, tampons, wads of toilet paper, balls of hair, grease, oil, table scraps, clothing, rags, sand, dirt, rocks, newspapers, cosmetics containers, or children's toys.

I believe this is because people who rent single family homes tend to be families with children.

The disqualified persons list includes spouses, lineal ascendants (parents, grandparents, etc), lineal descendants (children, grandchildren), and spouses of lineal descendants.You could take a participant loan from a Solo 401k and lend that money to a disqualified person without violating any rules.