They are making really costly mistakes, my tenants are unhappy, and I'm out thousands so far due to mis-communications, poor follow through, and neglect of maintenance requests.

Your costs will be high and unless the property is renting for a very high dollar amount, the return could be poor.

When you get your $140,000 loan you will be paying substantial costs and while you are working on the property you will be paying insurance, property taxes, utilities and I will bet the cost for heating while you are working during the winter will eat up a lot of cash.

With no track record, your extended family are your best bets for some startup funds. 

Your best bet is to get your realtor to provide there opinion of value.

@Marco Manomat I agree with @John Underwood seller financing is likley your best bet.

I am almost done reading "Rich Dad Poor Dad", which I'm pretty sure most of us here have read.

If you can keep your overall income including the cap gains in the limits for 0% cap gains is your best bet if possible. 

@Lauren Alpert They broke the lease and by most states legal standards, they should be penalized but you are in CA so all bets are off.

It is highly unlikely that attorney wants to go before a judge and tell him that his clients were rude to the repairmen, treated them poorly and would not let them in the house to continue to check on the status of the frig.