That's a very good question. As an example, this week I opened, officially, the roof at the top of the C.D. Howe Building. The roof needed to be redone, and it was redone with the greening in mind. I'm not an expert on how they did this, but they laid out a lot of soil and different types of materials, and on top of the building are a number of plants. These plants will help insulate the building from cold and warm weather, even those we don't own. We don't own the C.D. Howe Building; we're only a lessee.
When we're a large lessee in a building and we're aware that the landlord is about to do major work, or if we own a building and there is significant retrofit required, we put the policy in place; we use the opportunity of investment having to be done, capitalization having to be done to the building, to put into place our greening policy.