If an operator had debt locked in, who cares what the value is if you aren't selling.

Taking the market rents, accounting for a 10% vacancy, the debt service, PM fees and everything else, it seems like I should be able to cash flow about $600 for the 4 doors combined.

A debt relief company is probably your best and most cost effective option. 

@Doug KirkTo own 8-10 properties in 3-5 years, consider aggressively buying multiple properties or starting small and paying down debt quickly.

80 LTV should be doable as long as it's debt servicing.

Our mortgage is our only debt.

Unseen, I take the helm at night,Assuming debts without the light.The creditor remains unaware,That obligations shift elsewhere.A stealthy move beneath the moon,What method makes the shadows swoon?"

You could explore a home equity line of credit (HELOC).Just have to be careful to NOT get in over your head in debt and go bust!

@Sean ConroyThe cost of building is not going to go down, unless you're looking at the debt component.

You can start accumulating college credits right now, and graduate when you are 18-20, with little debt, if you really want it.