Amortization of Mortgage Points

Hi, 

 

We purchased a 4-plex at the end of 2023 and one of the units was used as our primary residence through 5/31/24. I'll be claiming the Standard Deduction this year, so nothing can be done with the points while the unit was our primary residence, but am I able to begin amortizing on Schedule E this 1/4 of the points paid beginning when the unit was placed in service as a rental (6/1/24)? Or would it have had to be placed in service as a rental unit right away upon purchase of the property in order to amortize the mortgage points?