We get our money through Check Writer Authorization - meaning, the tenants authorize us to write checks directly from their bank accounts so we get paid without waiting for the rent checks in the mail.

If the authority having jurisdiction requires the work you are proposing to be permitted then I would get a permit.

R.C. 4735.18(A) (34) provides that discipline may be imposed on a licensed real estate broker or salesperson for authorizing or permitting a person to act as an agent in the capacity of a broker or salesperson who was not then licensed as a real estate broker or salesperson.

If you have the tax id number, most taxing authorities have a website that you can check to make sure the taxes are paid.

Apply, or authorize the application of, rents from such dwellings for the person’s own use.(2)?

There was a thread about tax lien books and I commented and an author replied challenging my comment.

Low-income rental housing held for occupancy by families or individuals eligible to receive subsidies under section 8 of the United States Housing Act of 1937, as amended, or under provisions of state or local laws that authorize similar subsidies for low-income families.

I have no affiliation with the author just my humble opinion. 

Regardless if you received these or not, it is imperative that you contact your local housing authority office and ask them how to proceed.As you know, the rules vary from state to state and even by municipality.

Pointed you to entirely FREE seminars at the NH Housing Finance Authority that would explain the basics of real estate and financing to you.