Honda Canada will only sell a car that is leased to one of 2 people:
- The registered Lessee OR
- A Honda/Acura dealer.
Nobody else can buy it directly, so you either have to take over the lease ($450 admin fee), buy the car after the owner buys it (and pay the PST/GST on his purchase plus the PST on the new total) or work out a deal with the dealer. However, I suspect this is one the dealer may want to keep, so that may not be too easy.
But, $15K for an 05 Accord is not a great purchase for the dealer, even with 30Km on it. I suspect they can pick up equivelant cars at auction for $10-11K. It is a good deal for you though since the car is low mileage and you (apparently) know the history.
Lease residuals from 3 or 4 years ago are way higher than current wholesale prices due to over-optimistic manufacturers. Leases signed since about January 2007 tend to have more realistic residuals.