A straight lease-option can probably be done, as to doing it legally, it depends on which L/O deal you're involved in, what your position might be.

Reference SOS documents and summarize your 'deals' and I'm guessing it will all work out.

It might have back taxes, code violations, etc. that with the work involved make it upside down in value more than if you got it for free and fixed up and try to resale you still wouldn't make money but might work as a rental etc.You might want to look up who the filing BK attorney was and see if you can make contact with them to see where all of this is at.No legal advice.

How do you ensure your broker that you are being ethical and honoring your fiduciary duty and document your disclosures on paper?

No legal advice.

What kind of documents/contracts would I use?

Is it legal?

By the end of the day, your phone is blowing up with calls from 20 different people that mostly harass you into sending them your documents without providing any real information.

Let the broker know you plan to use an unconventional loan, but show the documented pre-approval.

For single-purchase raises for a specific asset it seem that best from the perspective of the promoter would be defined as:Least transaction costs and friction for presenting deal to investorsBroadest possible audienceLowest cost of capitalAdequate protection from lawsuits or legal risk both at the time of subscription and on a go-forward basisHighest likelihood of finding or maintaining relationships with investors for the longest period of time possible The motivation for a blind pool would be largely the same, but one would place more emphasis on the ability to forge long-lasting relationships with investors so they'll continue to invest in future placements or deals in general.