A little more information...
I entered the value of the Improvements in FEDERAL TAXES -> Rental Real Estate -> "Add Another Rental Asset".
From there I tried each of the first three options in the "Describe This Asset" page, but none of them resulted in 15-year depreciation (they were either 7-year or 2-year). The fourth option "Vehicles" clearly is not the correct option. So, no luck there...
