I track the principal as a Liability account in Xero, and whenever I add it to a report, it always shows the current balance, rather than the change over the chosen time period (like with expense accounts).  

If anyone has used a software they like that still posts on Zillow in the past 6 months please share! 

You didn't write how much 'sweat equity' you put into this place, but it was likely well worth it given the $400K cash out.  

It feels like 10K in PA is equivalent to 2K in NJ.

Your best and most efficient option would be a DSCR cashout refinance, more than likely.

Start by networking through local meetups, REIA groups, and online communities like BiggerPockets to connect with experienced investors.

You can PM me if you like and i include my telephone below.  

I think the biggest issue is the fact that the agent didn't disclose this from the beginning and it seems like he was trying to keep it a secret.

It sounds like you’ve got a solid foundation with your rental property, and I love the ambition behind your plans to build a property management and maintenance company—it’s a great way to take control of your investments while creating additional opportunities.Best of luck to you! 

Commercial properties are listed on places like LoopNet or much better CoStar.