We've used the standard government model for investment analysis as part of that. There are factors in it that are variable, as you would know, and certainly residual value is one of them--what's the residual value of the property. If you take a look at a Crown-owned building versus a private sector building, the residual values of our buildings are generally much lower because of our inability to invest and keep the buildings up to a good standard. There are other things, like discount rates, for which, when we do investment analysis, we use a sovereign rate for discount, which basically is saying that owning a bond and owning real estate is the same risk.
So there are challenges there.