For flipping, focus on accurate ARV estimates and budgeting for unexpected costs, while for BRRRR, building strong relationships with local lenders that can help streamline your hard money into your refinancing.

Couple of things I would add as I am an investor and also a licensed GC(i.e. builder)  there in the area. 1) That property might have a zillow estimate of 1.9 million but its only 4,000 sq ft. 

Im not sure I understand why its an issue that it was not included in the estimate for the loan.  

Best estimate is bad tenants are out near year's end.

I attached rough estimate on here, I included rehab on to the sales price 

At $1,600-1,800/month, how does this compare to your estimated HELOC payment plus other expenses (maintenance, utilities, etc.)?

Estimated to reach 10.5 Trillion by 2025. - 10guards.com: https://10guards.com/en/articles/cybercrime-as-empire-wou... 

Couple of details that would help the community here: what's your estimated value of house "A", the loan balance, and monthly rent?

The rent is calculated from the zillow estimates.

There is much confusion about the 4% and 6% in property taxes.Non owner occupied property is taxed at 6% of the value to get the taxable value.This does NOT mean your actual property tax is 6% of the purchase price for rental property,In reality property taxes are about 2% of the purchase price for rental properties and about 1% of the purchase price for owner occupied properties.Google Greenville County Property Tax estimator and play with it and get a sense of how it works.3.