Philadelphia could be an excellent market for your next real estate investments given your criteria and experience.

Sounds like you need to sell one or two, or you can do a HELOC (check more than one lender on HELOCs on them) to value add the deals (ADU, and or buy another property to cashflow). 

I am currently considering a deal on a very small park as a way to test if MHP's are going to be for me or not.

About to close a deal all cash for $1.46M and was going to get a cash out refi after to take out about $630K in cash.

However if are dead set on Owner Financing, you have to get get 20% plus down payment and if you are in Florida, you have to deal with a Judicial foreclosure process which is not nice to Lenders, I would highly recommend against it.

He "doesn't want to scare off his tenants if the deal falls through." 

Sharing a kitchen probably isn't a big deal for a short term contractor.

Welcome Francisco, I just closed a deal with 2 investors from NYC.

We plan to leave 25-40% of equity in the deal.

I'm actually headed back to my hometown area of Chicago to find my first deal next week.