Running the numbers & getting owner equity info

[Nancy Brandt]

I'm still a newbie with only my house hack/duplex going so far but we're not going to die from paralysis of  analysis so I'm still trying to figure out a few of the data points for the calculators.  My question is how can you determine if a property owner has a high equity position?  Things like taxes, etc are no problem but when I do my periodic walk around our city and spot an unkempt house/apartment building how do I tell if the owner is well positioned for self finance, etc?  Thanks!