In my world, family trust is commonly referred to as a credit shelter trust which is funded at the death of a grantor.

You close using buyers funds with full disclosure to the buyer, then DEED OUT immediatly to the BUYER and how they wish to take title.....

Is there anyway to calculate the end investor's desired yield of 8-14%?

If you have a decent amount of equity in your current rental why not HELOC or refinance and just pull money out of your rental to fund your next deal.

You may find that dibbling and dabbling is not the best route, unless you have unlimited funds and/or time.

. - you will have to prove source of funds for the purchase - if you opened any new unsecured debt when purchasing the home then that debt must be paid off when cashing out. 

I have two properties I have found but do not have the capital to fund them.

Pre-Payment Penalty: If they have one, is it a flat penalty or does it have step down component like 6% of loan amount if paid off in year 1 / 5% if paid of in year 2 / 4% if paid off in year 3 / 3% if paid off in year 4 or is there a loan yield maintenance fee if paid off earlyUse of Funds: What are the funds being used for?

Pay for expenditures that are only for the rental unit from rental funds.

yet took some rather odd actions.For example:Board started digging drains in front to of my house without ever acknowledging my engineer's letter about the damp, or coming in to look at where it was coming in.This was not recommended by the engineer.Meanwhile, I was waiting for funds to replace the carpets and while delays went on I had to move out the house because of the risk of mold.