Most of my tenants are upper middle class, 700+ credit scores, have graduate degrees, and are very professional (which makes my life much easier, and saves me lots of time--which saves me money).

To find recently sold multifamily properties, you can utilize MLS listings, real estate data platforms like Reonomy or PropStream (subscriptions required), public records, and networking with industry professionals.

Selling land can be profitable, but those who are most successful create real value through the entitlement process by seeking use or dimensional variances to develop something more than what the by-right zoning allows.

Please reach out to a professional property manager in the area, using a retail realtor is not the answer

Seems like a slam dunk for any professional if you don’t want to do it yourself in small claims. 

All calls and texts from my end have been very professional and requesting to work things out in a peaceful way that works for both of us. 

Maybe we should be seeking advice from you.At your age, time is far and away the biggest factor in your favor.

But yes - get advise from a qualified tax professional.   

I would seek help from the Wa LL Association, they will have lawyers on staff who can help.

I'd like to go one step further and suggest you start inverviewing professional property managers.