Would taking a commercial loan on the new home with an LLC be  an issue?

I'm sure some people have used Zelle and it is not an issue.

Other issues with turnkey is not knowing exactly what was renovated and how well.

Even my seasoned and great landlords are going to have major issues with this.

You may run into issues trying to take a HELOC out on an investment property, and even if you can I doubt you'd want to use it for a down payment for a primary because the rates are much higher.What kind of cash flow would you be generating from your multi once you move out?

Consider not just the purchase price but also renovation costs, property management fees, and local rental rates.Consider the Property Management Aspect: If you’re not planning to manage the properties yourself, finding a reputable property management company is essential to ensure smooth operations.Stay Updated on Local Regulations: Familiarize yourself with rental laws and regulations in Detroit to avoid any potential issues down the line.Feel free to ask any questions as you continue your journey.

Business issues or simply too high of a rent demand for the space provided?

The terms are different, so you might run in to some issues there. 

Let them know that there will be routine quality control checks/inspections so that if your third party inspector finds any issues with quality, the GC will be responsible for paying for the correction.These are just some theories that I think will help and plan to implement when I operate out of state flips.

Plus, taxing on social security becomes an issue if I do this later.