The LEED V4 Reference Guide states that "If a Phase I ESA is more than one year old, a new assessment is required".

At what moment is the duration since the previous ESA measured? Is it the time from the previous ESA to the time at which credits are submitted for review?

Does it matter if the site is a greenfield which is under the same ownership since the prior ESA, and has not been occupied since the prior ESA?