There are really two factors, Madam Chair. One is the type of client and the amount of fit-up required. High-security clients usually require a higher level of fit-up. When we're looking at that, we like to get a long-term situation. We always consider buying as the best option.
We're finding, though, that a 15-year lease is really the trade-off point. When you're doing an analysis, and landlords are looking at that, at the 15 year-point it starts to move from being a pure operating rental type to an economic rent. At the 15-year mark, you're also starting to incur some additional costs for rehabilitation of the asset. We try to really look at those numbers between 15 to 20 to 25 years as to whether we should be leasing or owning. But the 15-year mark is really the turning point between an operating rent and an economic rent.