So your lease buyout is called a capital lease in accounting.
So the lease is considered a liability and the item is a fixed asset subject to annual depreciation (if it qualifies in IRS Pub 946)
Create the fixed asset account and the liability account, do a journal entry,
debit the fixed asset account for the total of the lease (125 * 36 + 1)
credit the liability account
then you pay down the liability account