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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue |  |  |
Total revenue | $ 514,651 | $ 506,100 | $ 486,819
Operating expenses |  |  |
Property operating expenses | 129,885 | 130,209 | 121,890
Real estate taxes | 49,974 | 53,645 | 53,621
Third party management expenses | 10,088 | 10,547 | 12,800
Depreciation and amortization | 188,797 | 177,984 | 178,105
General and administrative expenses | 34,862 | 35,006 | 30,153
Provision for impairment | 131,573 | 4,663 | 0
Total operating expenses | 545,179 | 412,054 | 396,569
Gain on sale of real estate |  |  |
Net gain on disposition of real estate | 7,736 | 17,677 | 142
Net gain on sale of undepreciated real estate | 1,211 | 8,007 | 2,903
Total gain on sale of real estate | 8,947 | 25,684 | 3,045
Operating income (loss) | (21,581) | 119,730 | 93,295
Other income (expense): |  |  |
Interest and investment income | 1,671 | 1,905 | 8,295
Interest expense | (95,456) | (68,764) | (62,617)
Interest expense - amortization of deferred financing costs | (4,369) | (3,091) | (2,836)
Investment (loss) income | (77,915) | (22,016) | (26,697)
Net gain on real estate venture transactions | 181 | 26,718 | 2,973
Gain (loss) on early extinguishment of debt | 138 | (435) | 0
Net income (loss) before income taxes | (197,331) | 54,047 | 12,413
Income tax provision | (72) | (55) | (47)
Net income (loss) | (197,403) | 53,992 | 12,366
Net (income) loss attributable to noncontrolling interests | 614 | (168) | (77)
Net income (loss) attributable to Brandywine Realty Trust | (196,789) | 53,824 | 12,289
Nonforfeitable dividends allocated to unvested restricted shareholders | (567) | (456) | (421)
Net income (loss) attributable to common shareholders, Basic | $ (197,356) | $ 53,368 | $ 11,868
Basic income (loss) per Common Share (in dollars per shares) | $ (1.15) | $ 0.31 | $ 0.07
Diluted income (loss) per Common Share (in dollars per share) | $ (1.15) | $ 0.31 | $ 0.07
Basic weighted average shares outstanding (in shares) | 171,959,210 | 171,491,369 | 170,878,185
Diluted weighted average shares outstanding (in shares) | 171,959,210 | 172,325,646 | 172,273,240
Rents |  |  |
Revenue |  |  |
Total revenue | $ 479,849 | $ 470,851 | $ 451,519
Third party management fees, labor reimbursement and leasing |  |  |
Revenue |  |  |
Total revenue | 24,417 | 24,132 | 26,444
Other |  |  |
Revenue |  |  |
Total revenue | $ 10,385 | $ 11,117 | $ 8,856

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