Where do I enter those building improvements in Turbotax Home and Business?

I built a business warehouse 4 years ago that I am presently depreciating (it is on my personal property).  I added pallet racks and garage door seals to it this year.  I don't want to put them with misc. expenses because they are improvements that will stay with the building.  Where do I enter those building improvements in Turbotax Home and Business?