We have done an ASHRAE 62.1-2007 calculation back in September 2008, is it possible to submit that calculation if we intend to submit the end of our performance period as August 31st 2010.

I know there is an addendum saying that we can extend our performance period to a maximum of two years and a minimum of 3 months.

Would LEED allow this or would they require us to do the measurement and calculation again?