Deductions & credits

Under section : Home Office Expenses (Turbo Tax), they ask if I had "excess real estate taxes" based on my answer to the following questions: 

 

-If you paid real estate taxes but are not itemizing deductions, do not enter your real estate taxes here. Enter them as excess real estate taxes later.

-If you paid real estate (property) taxes on the entire home, enter this amount here and later go to the Deductions & Credits area and review the property tax information.

 

I use a small portion of my home as my office, and I am not itemizing deductions. It seems to me that both answers apply to me.

 

The next page reads:

If you're not able to deduct all of your real estate taxes, you have "excess" real estate taxes. (This is not common.) Do you have excess real estate taxes ?

 

How do I know if I was able to deduct all my real estate taxes and if I actually have excess real estate taxes?  

 

Thank you so much and I hope this makes sense.