Where should I record the additional small amount of real estate tax I pay for my driveway which is not connected to my main mortgage real estate tax?

This will be reported under additional real estate taxes paid. Please follow the directions below to enter your real estate tax into TurboTax:

• Deductions and Credits
• The first section is  "Your Home" 
  
• Find "Property Taxes" >> Select "Start"
• Follow the prompts and you will get to a screen titled "Enter any additional property tax you paid in 2017"