Another strategy is to put it up for sale. I did this with one property to get rid of bad tenants. But you have to actually sell it.
Your right to sell, so far is still strong. At least for Iowa law. Not sure of the interaction with some of the current laws.
Followup
I sold the problem property to one of my good tenants. Contract sale is a variation of renting.
Another thought for all. If you live in part of the duplex or even triplex, your are exempt from a lot of regulation since it is your home. These are old laws and I had to dig deep to find them still in place for Iowa.