18. SEGMENT REPORTING The Company operates in two business segments: (i) commercial and other real estate and (ii) multi-family real estate and services. The Company provides leasing, property management, acquisition, development, construction and tenant-related services for its commercial and other real estate and multi-family real estate portfolio. The Companys multi - family services business also provides similar services for third parties. The Company had no revenues from foreign countries recorded for the years ended December 31, 2019, 2018 and 2017. The Company had no long lived assets in foreign locations as of December 31, 2019 and 2018. The accounting policies of the segments are the same as those described in Note 2: Significant Accounting Policies, excluding depreciation and amortization. The Company evaluates performance based upon net operating income from the combined properties and operations in each of its real estate segments (commercial and other real estate, and multi-family real estate and services). All properties classified as discontinued operations have been excluded. Selected results of operations for the years ended December 31, 2019, 2018 and 2017, and selected asset information as of December 31, 2019 and 2018 regarding the Companys operating segments are as follows. Amounts for prior periods have been restated to conform to the current period segment reporting presentation (dollars in thousands) : Commercial Multi-family Corporate Total &amp; Other Real Estate Real Estate &amp; Services (d) &amp; Other (e) Company Total revenues: 2019 $ 178,699 $ 170,833 $ 1,403 $ 350,935 2018 251,477 113,805 432 365,714 2017 365,053 90,654 3,323 459,030 Total operating and interest expenses (a): 2019 $ 78,454 $ 89,512 $ 127,425 $ 295,391 2018 115,345 70,279 98,549 284,173 2017 175,401 63,590 85,873 324,864 Equity in earnings (loss) of unconsolidated joint ventures: 2019 $ ( 1,194 ) $ ( 125 ) $ - $ ( 1,319 ) 2018 2,319 ( 2,446 ) - ( 127 ) 2017 1,644 ( 7,725 ) - ( 6,081 ) Net operating income (loss) (b): 2019 $ 99,051 81,196 ( 126,022 ) 54,225 2018 138,451 41,080 ( 98,117 ) 81,414 2017 191,296 19,339 ( 82,550 ) 128,085 Total assets: 2019 $ 2,178,321 $ 3,079,409 $ 35,068 $ 5,292,798 2018 2,687,178 2,260,497 112,969 5,060,644 Total long-lived assets (c): 2019 $ 1,947,053 $ 2,812,306 $ 3,834 $ 4,763,193 2018 2,413,696 1,973,826 33,157 4,420,679 Total investments in unconsolidated joint ventures: 2019 $ 7,367 $ 201,724 $ - $ 209,091 2018 13,699 218,771 280 232,750 (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; real estate services expenses; general and administrative, acquisition-related costs and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate &amp; Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined and classified in Note a), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Segment assets and operations were owned through a consolidated variable interest entity commencing in February 2018, and which also include the Companys consolidated hotel operations. (e) Corporate &amp; Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense), as well as intercompany eliminations necessary to reconcile to consolidated Company totals. Mack-Cali Realty Corporation The following schedule reconciles net operating income to net income available to common shareholders (dollars in thousands) : Year Ended December 31, 2019 2018 2017 Net operating income $ 54,225 $ 81,414 $ 128,085 Add (deduct): Depreciation and amortization ( 132,016 ) ( 112,244 ) ( 142,319 ) Property impairments - - - Land impairments ( 32,444 ) ( 24,566 ) - Gain on change of control of interests 13,790 14,217 - Realized gains (losses) and unrealized losses on disposition of rental property, net 345,926 99,436 2,364 Gain on disposition of developable land 522 30,939 - Gain on sale of investment in unconsolidated joint venture 903 - 23,131 Gain (loss) from extinguishment of debt, net 1,648 ( 8,929 ) ( 421 ) Income (loss) from continuing operations 252,554 80,267 10,840 Discontinued operations Income from discontinued operations 27,456 26,134 22,878 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net ( 136,174 ) - - Total discontinued operations, net ( 108,718 ) 26,134 22,878 Net income 143,836 106,401 33,718 Noncontrolling interests in consolidated joint ventures 3,904 1,216 1,018 Noncontrolling interests in Operating Partnership ( 23,685 ) ( 6,866 ) ( 341 ) Noncontrolling interest in discontinued operations 10,421 ( 2,661 ) ( 2,370 ) Redeemable noncontrolling interests ( 22,615 ) ( 13,979 ) ( 8,840 ) Net income available to common shareholders $ 111,861 $ 84,111 $ 23,185 Mack-Cali Realty, L.P. The following schedule reconciles net operating income to net income available to common unitholders (dollars in thousands) : Year Ended December 31, 2019 2018 2017 Net operating income $ 54,225 $ 81,414 $ 128,085 Add (deduct): Depreciation and amortization ( 132,016 ) ( 112,244 ) ( 142,319 ) Property impairments - - - Land impairments ( 32,444 ) ( 24,566 ) - Gain on change of control of interests 13,790 14,217 - Realized gains (losses) and unrealized losses on disposition of rental property, net 345,926 99,436 2,364 Gain on disposition of developable land 522 30,939 - Gain on sale of investment in unconsolidated joint venture 903 - 23,131 Gain (loss) from extinguishment of debt, net 1,648 ( 8,929 ) ( 421 ) Income (loss) from continuing operations 252,554 80,267 10,840 Discontinued operations Income from discontinued operations 27,456 26,134 22,878 Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net ( 136,174 ) - - Total discontinued operations, net ( 108,718 ) 26,134 22,878 Net income 143,836 106,401 33,718 Noncontrolling interests in consolidated joint ventures 3,904 1,216 1,018 Redeemable noncontrolling interests ( 22,615 ) ( 13,979 ) ( 8,840 ) Net income (loss) available to common unitholders $ 125,125 $ 93,638 $ 25,896