Several options you can explore to get the down payment capital: Solo401k; HELOC on personal residence or from equity of the SFR; Cash Value Life Insurance Policy; Business Credit; Private Lenders, to name a few.

Is it worth to invest and learn from their program in order to start my co-hosing STR side business just to get some extra money monthly?

Finished my MBA (Business Analytics) in September and this work was part of my thesis.An official proforma has not been conducted.

I went through it anyway bc she had a good footprint online, I liked the designs, and a couple of ppl at another STR group recommended her (not an excuse, I was super busy and thought I was dealing with a professional).

@John Davey Interest on a home equity loan used to purchase or improve rental properties is deductible on Schedule E as a business expense, but not on Schedule A for your primary residence.

No business succeeded by drilling many holes.

They cannot continue a lawsuit on your behalf if you have not authorized it.I would send them a short demand:"You have five business days to stop the lawsuit and turn over all documents, funds, and anything else pertaining to my property.

Quote from @Benjamin Finney: I'm curious what real estate investors and private money lenders like myself use to inform their businesses strategy and predict future market conditions.

This is how I met my first clients and now a lot of my businesses is Repeat business.    

Quote from @Terrence M Brannon: Quote from @Garrett Cuppels: spent $15 on a book about Airbnb rentalSkip the Flip by Hayden Crabtree which was freeHow To Start A Profitable Airbnb Business in 4 Weeks: Optimize Your Profits and Go From Side Hustle to Passive Income With Minimal Effort What book did you buy?