It's a very simple and effective tool that you can use when evaluating rehabs, whether you're looking to flip or BRRRR. 

This approach could be the fastest and most cost-effective way to regain possession of the property and prepare it for new tenants.4o

Sub2 is a risky strategy for a long term buy and hold as the longer the deal structure stays in place, the higher the chance that issues will arise (like issues with the loan servicer, insurance, seller filing for bankruptcy, seller dying, seller realizing their DTI ratio and ability to buy their next property is negatively effected and becoming upset about it like in your case, due on sale clause being called, etc.).

However, in order to do this effectively, you have to have knowledge, experience, resources, and cash reserves in case things don't go exactly as planned.Hopefully this post was helpful to you in seeing a realistic example of how to purchase real estate without using your own money.

Effectively offering more than 100% financing.  

I have checked with our lender and keeping this home's mortgage will not effect qualifying for our next house.4.

Your referencing effective age vs chronological age. 

Quote from @Dominic Mazzarella: I would ask this, when raising capital for a real estate syndication, what strategies have you found most effective for building trust and credibility with first-time passive investors?

The PMS around here are pretty terrible, I've worked with a lot of the larger ones in Cleveland and I think they just take on more properties than they can effectively handle and don't hire enough additional employees to make it work. 

They don't understand how to price effectively, study the market, set boundaries with tenants, establish policies and procedures, communicate, and dozens of other things.