@Samuel Carmichael besides what @Brandon Ingegneri said about looking at absolute dollar amounts to figure out if it's even worth the aggravation, I also agree with @Michinori Kaneko about looking at percentages.Personally I look at percentages first, namely 1) cash on cash return (yearly money back after all expenses including mortgage, divided by all money invested to get it rentable) and 2) debt service coverage ratio (net income after operating expenses but before mortgage payment, divided by the mortgage payment).The first is (obviously) a measure of return, while the second is more of a measure of risk as it tells you how much of a buffer you have between the property's net income and the monthly fixed mortgage payment.After you get a little more experience you'll also start to factor things like replacement reserves into account.

Well someone finally returned a call and the problem is that I found the property on the Foreclosure list.

But it was damn risky and the potential returns ridiculous.

@Scott Inno First you need Trailing 12 Month and P&L, Even ask for Schedule E of the sellers Tax return. 

Make sure you learn and use it appropriately.There is some discussion about "velocity banking" where you use the heloc to pay your mortgage and it returns a slight advantage.

If you think the buyer might not refinance anytime soon and you want to maximize your return, you can go with longer terms.   

Alternatively you could mail it to them and pay the small charge to have a confirmation number that they have received it return to you.

I would choose to maximise my returns by investing my money where it will earn it's keep.

However, if the Joint tenants are married filing a joint return then technically it is only one taxpayer and not two. 

After a few months there was a disagreement between the two and him and my aunt left the property (it’s been about a month ago now) and refuse to return the keys and remove their stuff.