With only a $50 or $100 origination fee, and "essentially" not losing any money to an interest rate, TSP loans are probably one of your cheaper loan options out there.I just took out a 40+k loan from my TSP to invest in other ventures and it was a very simple and straightforward process. 

The deposit is common in commercial loans.

If you have shower doors remove than and install curtains.

Is there anything that would prevent me from refinancing using a vacation home loan now? 

Then I took out a HELOC to buy the second house hack and did an FHA 203(k) loan to remodel and expand the main house and convert the garage into an ADU.

I am currently doing my homework on how to obtain a loan under an LLC for a property that I would like to buy and rent out.

I learned about seller financing and was okay to offer a 30-year loan, a 5-year balloon, and 10k down.

Are you sure you can get a 30 year loan at 6.60% to purchase a property in this condition that needs $100k of work?

You get a 30yr loan on a fixed rate, the debt is paid by the tenants, while you still cash flow.

This is because FHA loans are assumable, which means that a potential buyer is willing to pay a higher price for a home if they can take over the existing low-interest rate mortgage.