I paid over $37k to replace the plumbing in my rental property in 2020. What type of rental asset is this? I do not see this type of improvement listed in the options.

Since the cost was over $10,000 I can't take the improvement as an expense, which is fine. However, I don't see any options in "Describe this Asset" that correlate to this type of improvement. It is not equipment, or land, or more property. I just need to know the correct thing to select. Thanks!