They were taxing as a fourplex, but the CO said it was a triplex.I found out when I went to try to refi with the bank.

Will the property taxes skyrocket?

You might even want to setup a C-Corp (for tax and liability reasons as well) to manage the business with the guests and pay rent to your LLC. 

I was just reading Mark's book "The Tax & Legal Playbook" this morning and it specifically had a "critical warning" (page 31&32 in Chapter 3).

Property taxes are also insane.

But higher tax rate in PG county. 

Thanks.Hi Courtney,BiggerPockets Pro members get access to all Stessa core (free tier) functionality – plus unlock exclusive access to advanced features, like unlimited portfolios and Schedule of Real Estate Owned (SREO), all at no additional cost.BiggerPockets Pro members have free access to all Stessa’s featured benefits as well as advanced features, like unlimited portfolios and Schedule of Real Estate Owned (SREO) – giving Pro members exclusive value not offered to Stessa Free members.Simplify tax time and help maximize deductions Organize financial data and accountingEasily track key property metrics to optimize and boost ROI. 

One thing to add is that when you buy a new build, your PITI will likely not be factoring in the correct state tax number.

Any way around paying the very high property tax, school tax etc. in SC?  

You'll be able to defer a bunch of tax with this purchase.