If you cant refi my bet would be to pile up the cash in a separate account so that you can build up a nice down payment for another duplex. 

I bet most of these guys in your area would know just by the address what the potential for asbestos would be and possibly could alleviate your fears by a simple inspection. 

Initial numbers work out pretty well but I'm still learning how to calculate the different metrics and which I need to pay attention to for my system, which is still a work in progress.

View report*This link comes directly from our calculators, based on information input by the member who posted.

You could use the BP calculator (5 times for free membership) or find some available online for free.The most important thing that is going to get you ahead: commit to do 1 thing at least every day that is going to get you closer to your goal of acquiring and creating wealth through real estate: read, analyze, go to open house....Hope that helps.Good Luck

Property is a duplex.Thanks View report*This link comes directly from our calculators, based on information input by the member who posted.

I wrote a BiggerPockets blog post about how to find comps and calculate ARV, hope it comes in handy:https://www.biggerpockets.com/blogs/8814/68395-how-to-find-real-estate-comps-and-calculate-after-repair-valueI've also written about how to estimate repair costs:https://www.biggerpockets.com/blogs/8814/72452-how-to-estimate-construction-costs-for-these-29-common-rehab-projects

I have started getting on hudhomesstore.com today and scoping some deals out and will start using the calculators here to get a good idea of what I really need to be looking for. 

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

Not sure how he finds his lists, but I think your best bet is to find owners with equity.