Both of these expenses are for things that improved the value of your condo and will last more than a year. So they should both be depreciated.
However, the safe harbor election allows you to expense items that are depreciable normally but are expensed on your books and are not in excess of $5,000. So you can expense the plumbing and depreciate the renovation.
The IRS rules on this can be very dense.
Here is the IRS language on what needs to be depreciated (scroll down to depreciation)
And here's the IRS language on safe harbor elections.
@jimlenz
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