I would try to network with other MTR landlords in the area to determine best course of action 

In your case, I would simply point out that they forgot to give a value for that space.

I am try to determine if it is worth looking into these again.  

Income alone is not a determining factor, as any truly Good co-signer will have a lot of assets...perhaps paid off home, 100K or more in cash equivalents, they may even actually be retired.

Simply put.

I'd sell or let her buy you out at fair market value as determined by an appraisal if she wants to keep it.

Or simply google search multifamily conference near me and see what comes up!

It's critical to do your research and determine which platform is best suited for marketing yourself or your organization as a landlord.

It’s advisable to consult with a tax professional or financial advisor to determine the most appropriate approach for your circumstances.

BUT, please be aware of the followingMissing interest payments on a promissory note is not necessarily the result of a fraud, most often it is simply the results of a poorly performing business.