Barton Inc, a U.S. corporation, includes buildings on its 12/31/2018 balance sheet with a book value of $54,000,000 (cost of $72,000,000, and accumulated depreciation of $18,000,000). This indicates

The buildings fair market value is $72,000,000 at the balance sheet date

$18,000,000 of depreciation expense was recognized on buildings in 2018

The undepreciated cost of the buildings is $54,000,000 at the balance sheet date

The buildings fair market value is lower on 12/31/18 than it was on 12/31/17