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v3.10.0.1

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues: |  |  |
Rental revenue | $ 493,231 | $ 483,944 | $ 460,653
Tenant expense reimbursement | 72,372 | 73,679 | 73,459
Observatory revenue | 131,227 | 127,118 | 124,814
Lease termination fees | 20,847 | 13,551 | 7,676
Third-party management and other fees | 1,440 | 1,400 | 1,766
Other revenue and fees | 12,394 | 9,834 | 8,985
Total revenues | 731,511 | 709,526 | 677,353
Operating expenses: |  |  |
Property operating expenses | 167,379 | 163,531 | 153,850
Ground rent expense | 9,326 | 9,326 | 9,326
General and administrative expenses | 52,674 | 50,315 | 49,078
Observatory expenses | 32,767 | 30,275 | 29,833
Real estate taxes | 110,000 | 102,466 | 96,061
Acquisition expenses | 0 | 0 | 98
Depreciation and amortization | 168,508 | 160,710 | 155,211
Total operating expenses | 540,654 | 516,623 | 493,457
Total operating income | 190,857 | 192,903 | 183,896
Other income (expense): |  |  |
Interest income | 10,661 | 2,942 | 647
Interest expense | (79,623) | (68,473) | (70,595)
Loss on early extinguishment of debt | 0 | (2,157) | (552)
Loss from derivative financial instruments | 0 | (289) | 0
Income before income taxes | 121,895 | 124,926 | 113,396
Income tax expense | (4,642) | (6,673) | (6,146)
Net income | 117,253 | 118,253 | 107,250
Private perpetual preferred unit distributions | (936) | (936) | (936)
Net income attributable to common unitholders | $ 116,317 | $ 117,317 | $ 106,314
Total weighted average units: |  |  |
Basic (in units) | 297,258 | 296,455 | 276,848
Diluted (in units) | 297,259 | 298,049 | 277,568
Net income per unit: |  |  |
Basic net income per unit (in dollars per unit) | $ 0.39 | $ 0.39 | $ 0.38
Diluted net income per unit (in dollars per unit) | $ 0.39 | $ 0.39 | $ 0.38

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