We don't have, in fact, because there are so many variables in buildings. It depends where the building is, how big it is, how committed the owner is, what level of certification has been targeted, what technologies have been applied. There are so many variables.
Generally, we say what we have found--and I have to tell you this anecdotally--is that in areas where there's more experience.... For example, in western Canada, and in Ontario as well, you can get a LEED-certified building, a LEED silver building, at virtually no additional cost. Additional costs are very low--maybe 1%. So the paybacks are within the year.