I consulted my cpa and he states that I will owe 100,000 in taxes leaving me with 600,000.

I invest in tax sales, mainly land.

Sell - Would prefer to avoid this to keep my low interest rate (3.3%) and avoid fees/taxes. 

Cost segregation studies can offer real estate investors massive tax benefits.

She might not qualify for another loan, unknown it depends on if she can show it as positive rental income but with your plan it sounds like she won't have tax returns in the future to make this work. 

Any ballpark idea what percentage our property taxes would go up if we went from 2 to 3 units and how does that get plugged into the calculation?

I am also extremely interested in Portfolio loans, but I have zero contacts dealing with those types of loans.Finally, I have an 'excellent' credit score, no debt at all besides 5 other rentals at 75/25 LTV (all cash flow positive) and a job that I claim over 100,000 in taxes, and have three years of consistent tax returns showing that.

For example, in an 80/20 equity split, that 20% could legitimately be called the "promote."

If the Florida property could cash flow or at least pay the mortgage taxes and insurance, utilities ect then they would just have a payment for their house by me.  

I also got the taxes reassessed and cut by more than $7k per year, due to the tax assessment being overvalued compared to my purchase price.I just went through the process of getting a 25-year commercial loan put on the property with my usual lender.