According to the guide:

Track energy use monthly, beginning at least 12 months before the final day of the building’s initial LEED
O+M performance period.

It is not clear to me what does initial mean in this sentence...

Do we need to track energy 12 months before the last day of all the performance periods ? In the project the last performance date of all performance periods is December 31 2017, i will need to track all 2017...???

Or does it have to be tracked 12 months before the beginning of the earliest performance period? My earliest performance period is March 01 2016 so i will need to track until March 01 2015....?????