@Brett Jones yep they are expensive, especially at that scale but consider the maintenance costs of additional heating systems and how he numbers change with more units.

It's not great either but they are stating if given this deal once I have 5 properties; they will allow me to convert my 5 properties (I have an LLC but the properties are all in my name not in the LLC yet) over to a commercial loan (5 properties min) and give me a line of credit to continue buying additional properties.

Permitting for additional bedrooms and garage conversions requires compliance with zoning and building codes.

In terms of Costs associated with an LLC-Roughly like $100 to file with the secretary of state in Ohio if you wanted to do it yourself-Cost for your accountant to prep a tax return at the end of the year for that LLC (depends on your accountant)-Cost of a higher interest rate with a DSCR loan -Maybe more advanced, but if you have more rentals the cost of additional bookkeeping software like having to pay for additional quick books accounts.

I'm bringing on my friend as a consultant to further our knowledge base and create some additional comfortability with the financial investors.

I wasn't sure if I needed to add in anything additional from a legalese perspective. 

Additionally, I’ve been wondering if it might be possible to create an LLC, rent my house to the LLC through a formal contract, and then have the LLC operate the Airbnb.

Additionally, you may be asked to show some availability of liquid cash/assets to weather a storm in case something unplanned happens. 

I'm concerned that the combined load of heat pumps and ancillary heat strips, along with other appliances, might exceed the 100-amp capacity during winter.As part of our future plans to add a third unit and separate the utilities, we intend to install two additional meters: one for common areas and one for the new unit.

These are professionals with additional training and a stricter code of ethics.