How to finance new guesthouse?

[Jimmy Sont]

I'm looking to build a 200k guesthouse in my backyard that will have good cashflow. My mother originally agreed for me to refi some money out of the equity of a house we co own but then she changed my mind after I signed the contract on the guesthouse. Long story short, I have no primary home and the property the guesthouse is being built on is a LLC with 3 years remaining of 20k PPP. I was looking into unsecured personal loans but they only cover about 50-100k for 1 year duration. I'm okay with a high interest rate up to 15% because I can still breakeven on the mortgage but not sure how to finance this deal without losing my initial payments