Based on your description, Party 1 seems like the safer choice.

Emphasize how this arrangement could work to their benefit, offering steady income, avoiding a traditional sale process, and giving them the freedom to move forward with their plans such as buying that sailboat and sailing around the world.If they ultimately decide they’re not interested in selling, you’re still in a great position to continue your search and buy your own property in the near future.

I used Roofstock to sell one of my rental properties in TX as their sales commission is lower than going through traditional sales channels. 

I went with the conventional option for a few reasons, but that's not the best choice for everyone.

As a side note typically I do not use my deferred tax dollars to invest in traditional real estate as the benefits (depreciation etc) are all lost when using a self directed IRA - My guess is build to rent will provide little to no cash flow to build the account - it will all be locked in the property. 

There are still a few that will give you a loan but the traditional 90% of purchase price and 100% of rehab might not be possible without an exception.

whats traditionally referred to as "DSCR" loans are not going to be eligible in non-state territories unfortunately

Depending how much of the neighborhood is a hot zone for renting rather buying, and which Property type is performing better than the other (meaning 1bd 1ba 2 floor renting out faster and much more consistently than a 2bd 1ba 1 floor), you can make your choice of those factors as well as other ones that impact your decision for what you wanna do with your investment.

Im hoping to find an investor to help me buy the lot next to mine so i can move up from doing tax deeds.. if not i have my next lot picked out and will continue to invest in them while i fix my credit and learn more on investing.. i have always wanted to be successful in life but drugs and bad choices have kept me from it.. now im proud to say there is nothing that will stand in my way of realizing my dreams Just following up.

Our issue is income on papers too low to qualify for the an FHA or traditional loan.