Hi Mike,I'm a Los Angeles area based mortgage broker that can assist.

Most of the ones I bought had existing tenants and almost all were paying below market rents and way below market rents.

House hacking can work with an FHA loan, as rental income from other units might help you qualify, but be sure to consult with a lender or mortgage broker to explore flexible options based on your unique situation.Good luck!

The house I regret most for not getting it is this one,https://www.zillow.com/homedetails/N8064-975th-St-River-Fall...I was so close to getting it, but I chickened out because I have absolutely no idea how these houses even exist.

I do not know how they are handling new customers verse the Midland existing customers.Regarding the customer service it seems the people I dealt with are still employed and only my "personal rep" as it were, was promoted and another took her place.

I rented out two rooms in my house to help offset my mortgage. 

That will determine if you could sell it and use the money to buy a single family home or would need to take out a mortgage. 

It's an estimated cash on cash return given current rental rates subtract expenses assuming 7% interest rate, 10% management fee, 5% repairs, 5% capex and other expenses like mortgage, insurance, tax. it's a estimate to tell you what properties to analyze vs ignoreyou can see the are pockets of negative returns as well as pockets of positive return. this is to supplement the data @Devin Conley provided

If you want me to send you my link tree it will show upcoming events at my mortgage brokerage A and N (we host events with investor groups, and networking events weekly).

What is the best way to best way to deal with the existing tenants?