How do I get the 179 deduction for a new roof on a commercial building? Turbotax Business isn't giving it to me

I put a new roof on a commercial building that my trust owns and rents to others. I want to take a Section179 deduction for it, but I can't find the way to make Turbotax Business (Partnerships, Corporations, LLCs, Trusts & Estates) give it to me. When I enter the asset (the roof), answering the questions with what I think are the correct answers just results in a depreciation deduction amortized for 39 years.