Compute the book value of the campground's buildings to be reported in the current year's December 31 balance sheet.

Depreciation on buildings owned by the campground is based on a 25-year life. The original cost of the buildings was $600,000. The Accumulated Depreciation: Buildings account has a credit balance of $310,000 at December 31, prior to the adjusting entry process. The straight-line method of depreciation is used.

I found the depreciation exp is 2,000. My question is what is the book value?