Commercial buildings and improvements generally are depreciated over 39 years, which essentially means you can deduct a portion of the cost every year over the depreciation period. (Land isn’t depreciable.) But special tax breaks that allow deductions to be taken more quickly are available for certain real estate investments.
Some of these were enhanced by the Tax Cuts and Jobs Act (TCJA) and may provide a bigger benefit when you file your 2018 tax return. But there’s one break you might not be able to enjoy due to a drafting error in the TCJA.