Writing off an ADU and an add-on at a rental property

[pbmunkey]

I am building a detached ADU (accessory dwelling unit) and an attached add-on to my rental property that I'm not living at. I have been filing my rental income on a schedule E.

1. How should I depreciate this on the Schedule E? I'm assuming it's going to fall under:  "Assets / Depreciation" -> "Rental real estate property" -> "Land improvements" ? 

2. And if prompted to write off the entire amount using the special depreciation, I am allowed to, yes?

[ColeenD3]

1. How should I depreciate this on the Schedule E? I'm assuming it's going to fall under:  "Assets / Depreciation" -> "Rental real estate property" -> "Land improvements" ? No, this is not a land improvement, it is a building. Choose Residential Real Estate.

2. And if prompted to write off the entire amount using the special depreciation, I am allowed to, yes. No, this is depreciated over 27.5 years.