North Carolina Property Taxes

I am looking at a commercial property in Guilford County, NC.  I am trying to figure out a strategy to obtain the property.  

1. According the Guilford County Tax Department, the owner owes $19,257.02 in taxes since 2007
2. I have a decent relationship with the seller
3. I have asked a local commercial realtor to obtain comps on the property

How does the tax redemption work in the state of North Carolina?

Does it list on the Tax Department website if the taxes have been purchased?