ABC Corp. purchased land for $500,000 and a building for $1,000,000. The land has an indefinite useful life, and the building has a useful life of 25 years and a salvage value of $100,000. Calculate the total depreciable amount for the building, the annual depreciation expense using the units-of-production method, the book value of the building after 10 years, and the total depreciation expense over the building's useful life.