At the end of it all, I just try to leave a safe enough profit margin to smooth out any errors I may have made in the evaluation. 

But I do not want to speculate on what I would be able to sell it for just yet, and I want to make sure my numbers are safe for my ultimate goal of buy and holds.

Based on using 800 rent to be safe and 50% total costs annually.

You have to do the hard things.You have to make the call you’re afraid to make.You have to get up earlier than you want to get up.You have to give more than you get in return right away.You have to care more about others than they care about you.You have to fight when you are already injured, bloody, and sore.You have to feel unsure and insecure when playing it safe seems smarter.You have to lead when no one else is following you yet.You have to invest in yourself even though no one else is.You have to look like a fool while you’re looking for answers you don’t have.You have to grind out the details when it’s easier to shrug them off.You have to deliver results when making excuses is an option.You have to search for your own explanations even when you’re told to accept the “facts.”You have to make mistakes and look like an idiot.You have to try and fail and try again.You have to run faster even though you’re out of breath.You have to be kind to people who have been cruel to you.You have to meet deadlines that are unreasonable and deliver results that are unparalleled.You have to be accountable for your actions even when things go wrong.You have to keep moving towards where you want to be no matter what’s in front of you.Source: http://www.businessinsider.com/hard-things-you-need-to-do-to-be-successful-2014-1

I'll try to reevaluate my techniques according to what you said on my next day off. 

It's likely safe to say OP has underwritten zero loans.  

To much liability in a driveway/walkway that is not in safe condition.

The only way to be 100% safe from an unstable/violent tenants is to not own rental property in the first place. 

It is safe to assume, I suppose, you paid less than $42k since that is the SF sale price.  

@Larry Turowski and @Dustin Kester  I'm fortunate with my current PM, he's actually scaled down but used to operate under a company named Safe Harbor Management.