Defining “item” for de minimis safe harbor

I had a concrete sidewalk and concrete patio poured for my rental unit in 2020. To me, they are separate “items”. Each functions independently of the other.


But the combined cost was over $2500, and the contractor did not split the cost of each “item” on the invoice.

 

If I split the cost myself based on square footage (super easy/logical to do), it would easily put each under the $2500 threshold for expensing under de minimis safe harbor rather than capitalizing.

 

Is this allowed? Seems silly to ask the contractor to send me a more detailed invoice in this particular case.