It is not  optimal for long term debt. 

Why I choose to not reveal my legal name to the general web forum world - those I have done deals with, or worked on deals with, who are on this forum know who I am and that's enough for me

Then go to the city or county building department web page and look up the construction permits for those properties.

I recognize that there are going to be sub-to that were owner financed at high LTV (>=95%) that barely appreciated, but it is likely below 0.1% of listings and the odds of it being an optimal investment purchase make the odds even longer.I would look at sub-to as potentially a way to get way below current rate loan and not as a low down option.  

Overall, I had a decent experience throughout the process as it generated good passive income and my involvement was minimal.However, now that I have more time at my hand, I am interested in making the process and my investments more optimal in terms of cash flow.

Optimize Your Portfolio- Sell Underperforming Properties: Evaluate your portfolio and consider selling properties with lower returns.

Hi Gordon, I am interested in whether you were able to find the correct entity structure for this partnership/operator from a cost/risk/return optimization perspective.

Make sure you are optimized there first, then branch out.

After doing a web search, I wasn't able to find much information about invest1, or the properties they offer, which concerns me a bit honestly.  

Learn more by setting aims, growing your friend net, and diving into sites like BiggerPockets and other web spots.