Entering depreciation info for Boiler for apt. house

We have a boiler for heat in our apt. house. I'm adding purchases for it to dep. schedule in TT.

Under the "Describe this asset:" screen, do I choose Rental Real Estate property (top of list
of choices) or Tools, Machinery, Equipment, Furniture
near bottom of choice list?

Depending on which I choose, I'll get two different screens when I click continue.
So then when it goes to next screen, which category should I choose?

None of them really seem spot on for this.

Over the past 28 years, the boiler is still on the books with some depreciation left as of last tax year. It was depreciated over 27 years.

Thank you for any help!