True, there is tax court if they go against you, but for the most part that's not a realistic alternative.

Or are there other alternatives for tenant screening and marketing while I continue using cozy?

.- If interest rates remain high, this is further upward pressure on rents in the near-term, as the alternative to renting - buying a home with a mortgage, is expensive - this should increase demand for rentals. - Rents are also a function of supply - 2024 saw the most new construction of multifamily units in American history (nearly 575,000 estimated 2024 deliveries of new multifamily inventory), and 2025, while not a record setting year, will see deliveries top 500,000 again - a huge supply increase. 

.: I'm looking into alternative ways to sell a rundown house for my parents.

Most are traveling professionals needing an alternative to a thousand dollar a week hotels.

Or alternatively any of the following that would have a similar outcome.

There is a much better alternative!

Alternatively, you could split it between House 2 and 3 in a way that covers your building budget for the apartment.

Posting is insufficient, absent court order for alternate service, if the property is not vacate.  

Quote from @Phillip Austin: There are two alternatives to a security deposit, which I speak about in my book.