The new furnace and sewer line should both be classified as Residential Rental Real Estate Assets, and depreciated over 27.5 and 15 years, respectively.
IRS Pub 527 - Residential Rental Property (page 9)
IRS Pub. 946 - How to Depreciate Property (page 97)
@MikeMa
[Edited 1/19/24 | 12:05PM]
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