You are in a difficult and stressful situation.

Second, how can the park perform after I optimize income and reduce expenses to where they should be. 

@Thomas J Mele I wouldn't stress too much about the interest rate on your HELOC because it is interest only anyways.

What I see on my properties is that I pay somewhere between 1200-1500 for the price you have used(in GA).Also, you should stress test your property by changing numbers like 20% vacancy, 30% maintenance.

Lets face it, buying a property is stressful, and the loan process is its own "ball of stress." 

Any suggestions on executing this type of multi transaction and reduce my closing cost in terms of Title+doc fees?

I have a friend who wants to rent our property and we're willing to give them a reduced rate while they look for a home in our area since we are travelling. 

You should consider accepting them and then find a way to screen them to reduce your risk and monetize them to increase your income.I require all animals be screened through petscreening.com which includes copies of vet records, picture of the animal, and more.

OP wanted to know if NY state grant exemption to homeowners, as they do in Florida, thereby reducing their taxes, and if so, by how much.

Adding the new HELOC will reduce the score about 7 points for every $100000; it too will change the score lower by 10 if you cash out 100% of the line.