If I'm following your logic correctly, your situation is:You have a previous HELOC on your primaryYou want to refinance to new rate/ termYou'll be paying off your HELOC from some other source prior to the refi (NOT via a cash out during the refinance)If that's the case, you shouldn't have any difficulty (other than perhaps some loan officers not being up to date on the regulations, or having other weird overlays). 

Find out how hard the water is and how often it needs to be checked and test as per EPA regulations..

You should know that laws and regulations change from state to state and obviously from one country to another when it comes to real estate investing.

auction.com website hosting bank owned, there seems more possibility to do hard money.as a rule if you're dealing with a county's auction directly even hosted by aucton.com that defaults to county, I would not use a lender (hard money company) regulated  by the state or national level) and i dont think they can fulfill a county auction closing timeline and you lose your deposit.

Other than just paying attention to the zoning regulations, Is anyone aware of a tool that will help identify the percentage of each in a given area?

There are penalties and interest with several laws governing this. 

@Daniel Mendez I tend to focus on outlying markets, they have cheaper land cost and better zoning regulations for building high density affordable housing. 

You want to make sure there are no issues with city or county regulations.

There are very few tools that the government can use to boost the economy.

What are cities that have favorable regulations for Airbnb and a good market since I don’t have to operate in Philadelphia?