This is obviously a subtle advertising post to attract investors, without getting flagged. 

The rates are still low enough to make the rate almost as attractive as the investment itself (that was borrowed from @J Scott).  

I am just wondering if there is an alternative with financing or otherwise I have missed or not understood. 

They can discuss the pros and cons of this strategy as well as alternative ideas.

Seller finance is also a potential possibility, I'm just trying to not limit myself to these alternatives if possible. 

Alternatively, I could put the investment in a more passive K1 offering (development) that's projected to grow 30% in 2 or 3 years. 

If you have self-employment activity, you can continue to grow the retirement funds by investing them into real estate and other alternative assets.

If you chose to reinvest that money you should be able to make it make much more than $800/month.An alternative approach if you strongly believe that future value will be much higher would be to harvest the equity and keep the property, but the new mortgage would essentially destroy your cash flow. 

One possible alternative would a digital insert?

I live in the Pacific Northwest, I'm a bit priced out of the market, I'm attracted to buying a duplex or fourplex in some state in the Southwest or Southeast where I can better afford to buy, I would like to move there and live in one of the units, but it seems like an overwhelming project to decide where to buy it seems there are a lot of factors involved and it's difficult for me to come to a decision.