I had three clients who made offers on good deals in 2018 using 203k loan products, and only one of the three deals closed...

If each co-owner has an undivided half interest then have the co-owner who wants to sell, write out a detailed affidavit with any available documentation -listing all of the expenses that each co-owner has paid for mortgage, taxes, insurance, maintenance etc, during the last three years (or whatever your local statute of limitations is to file for unpaid debt). 

Expenses tend to be higher long-term for lower-tier props so you'll want to self-manage to keep costs low.Good luck!

However, the three that this landlord owns are under the same roof and side by side.

We own three rental properties, one is paid in full.

So backstory, this deal is one my friend found, and he’s curious what BP thinks (he is not yet a member even though I tell him everyday to make a free account).So he lives in a townhouse and his landlord owns three in a row, all connected, under the same roof.

We have three buy and hold, but want to have some cash free for our next personal home.

We have three buy and hold, but want to have some cash free for our next personal home.

What is the best source of financing for three beginners?

Figure out what the property was built as (most likely single family) and see if there was ever paperwork filed to convert it to a three family.