increased the size of my home office by opening-up a wall

I have a home office / studio where I regularly see customers. I needed more space in order for customers to have room to sit while they're waiting. to achieve this, I opened-up a wall in my home office / studio thereby increasing the size of my home office / studio. the cost to do so was $4,150. this improvement was done exclusively for the benefit of the home office / studio in order to expand its square footage. 

 

I need help determining where and how to capture this $4,150 expense in turbotax.

 

thank you.