Your situation is unique and so is your partner's and we don't know what it is.

Competitive multiple offers occur only on select properties, while others languish on the market.

Have you already selected a builder? 

Getting less every month is still generally more cost effective than dealing with a tenant that stops paying or causes damages to the property.However, if you do decide to change your selection criteria and you are worried about fair housing, the main thing is documentation.

Simple enough.What makes it unique is that we have operated a profitable and successful business out of our home for nearly 4 years as a highly booked Hostel and event space + potential urban market farm.

We had a unique ability to rescue these most folks simply did not have the same abilities.

Instead of just buying into a training/coaching program for $8000, (That is what cost as of yesterday) they have a bank and financing available to the group that seems to be unique. 

My in-depth knowledge of the DFW market allows me to provide clients with access to off-market opportunities and tailor financing options that meet the unique needs of both new and experienced investors.

You can’t selectively apply the loss.

Before you dig into construction costs, I would try and find someone who can finance it as a tree house is unique and not every lender may finance that.