Step #3: subtract the cost that a developer allows for for knock down and re-designing/approvals.

Leading me to ask, "What are the legal remedies available to me that can be used to address this woman in such a way that she understands continued t 

We help the foreigner (individual or company) to buy the property, then we renovate (I have two interior designers/project managers in house), then we rent to other foreigners fixed to hard currency (mostly USD but sometimes EUR), then we manage the property.

This reduces the number of deals available substantially.I would not attempt a sub2 without an attorney doing the legal work.

Nothing will protect you against fair housing claims and other legal mistakes you make. 

Whatever you do, try try try to keep in mind that this is not your personal residence and not a TV design show.

Keep in mind the tennats have legal aid (hall trolls) representing them for free and they are in a "good old boy" relationship with the adjudicators.

I think I need legal advice to force some action.

On a personal note, while the home has a cool factor to it, the interior flow of these homes can be a little disjointed  due to the shape and I would spend a lot of time on the design to minimize these issues if possible. 

In some states, you may still have to go through an eviction process before you can legally take procession.