Look up the tax rate in that area and multiply 80% of the purchase price by the rate to get your likely tax rate

I would:STEP 1: See what my average daily rate would be as a short term rental buy going to airdna.co and checking your zip codes, top properties, similar properties go to the rates tab to see your average daily rate and multiply it by 30 and or go to the revenue tab and be sure to adjust your amount of rooms and how many you can accomodate.

Your home, appliances, and mechanicals are getting older and this will only multiply this tenant's complaints2.

Multiply that by 2 years and you could be $600k in the hole.

***Note, the lender must calculate the rental income by multiplying the gross monthly rent(s) by 75%.

You should consider the All In One Loan for multiplying homes.

The way South Carolina calculates property taxes for primary residence vs. non-owner occupied leads to a significant increase in property taxes when you move out and turn the property into a rental.The residence’s market value is multiplied by an assessment rate (4% for primary residence vs. 6% for non-owner occupied), and then the local millage rate is applied to determine the property taxes due.Once this is calculated, it could lead to the property taxes on the rental being 3x higher than when it was your primary residence. 

Multiply your ARV my .7If your purchase and rehab estimate is more than that i would think twice on the deal 

Thanks for getting back to me guys.The deal specifics are:8 unit seller financed in Laredo, TX $700,000 purchase price 10% down4% interest only payments for the first year After that it goes into 4% interest for 6 years Returns for the investor are 8% preferred return, and a 1.75x multiplier.

Not sure if CAD pulls your reported occupancy tax collections or not to see what your gross rent is, but I expect they could and value your property accordingly with some kind of multiplier.