According to the guidance I've seen from LEED, your performance period for recertification is from the time you were certified initially up until the time you submit for for recertification. Therefore if you wait 5 years, you are expected to provide 5 years of data. Well, what if you simply wait until that 5 years expires, and then simply start again with 3 month performance periods? That seems to make more sense than gathering 5 years of data.