please explain in steps

Sep. 1: Sold a building that cost $520,000 (accumulated depreciation of $285,000 through December 31 of the preceding year). Ellie Johnson Associates received $420,000 cash from the sale of the building. Depreciation is computed on a straight-line basis. The building has a 40-year useful life and a residual value of $25,000. Before we record the sale of the building, we must record depreciation on the building through September 1, 2018 Accounts and Explanation Date Debit Credit Depreciation Expense Building 8,250 Sep. 1 Accumulated Depreciation-Building 8,250 To record depreciation on building