There is a $330,000 First Mortgage Debt under the agreement of the commercial loan can be assumed by a new person. (2/3)there's an easily assumable mortgage.

My main REI goal is to build a profolio of multi family properties.

You also don't mention how long you owned these SFR, If you purchased them 5 years ago, and as you say, they bring you $200 today then your expectations don't make sense because you had time on your side to grow rents and reduce debt etc . maybe. you will do good to get $80 at purchase and $100-$150 once reposition after 2- 3 years. 

I'm relatively new to RE, but have recently made up my mind that it's going to be one of the main components to my long term wealth building strategy.

Looking for ideas on a Debt investment.I have $20,000 to invest in a debt fund or with partner. 8% + return, 6mo-2yr tie up.Prefer seasoned company with many successful deals to their credit.Non-Accredited, SDIRA acceptable.Thanksps: I am not looking at this time for anymore equity investments

That is the strategy I mainly implement.

It was my first investment and it wasn't much of a deal but on a 15 year note had rapid debt pay down and years later was able to refi and purchase a mulit-family.

We are mainly looking at SFH and small multi-family if we can find it.

This post applies to Maine landlords, but may be useful for others as well. 

Some banks I've talked to will loan 80% of appraised value minus the the debt owned.