Safe Harbor - cost of land vs building

I'm trying to understand how to calculate the maximum deduction allowed under the Safe Harbor for Small Taxpayers.

Total cost of property: $360,000 (from closing statement)

Land cost: $125,000 (from county tax assessment)

Safe Harbor maximum: (360,000 - 125,000) * 2% = $4700

 

is this correct? or can I use 2% of entire $360,000?

 

Thanks!