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Net Income Available to Common Unitholders Per Unit of the Operating Partnership | 12 Months Ended
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Dec. 31, 2020
Kilroy Realty L.P. [Member] |
Net Income Available To Common Unitholders [Line Items] |
Net Income Available to Common Unitholders per Unit of the Operating Partnership | Net Income Available to Common Unitholders Per Unit of the Operating Partnership The following table reconciles the numerator and denominator in computing the Operating Partnership’s basic and diluted per-unit computations for net income available to common unitholders for the years ended December 31, 2020, 2019 and 2018:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands, except unit and per unit amounts)
Numerator: |  |  |  |  |
Net income attributable to common unitholders | $ | 189,609 |  |  | $ | 198,738 |  |  | $ | 263,210 |
Allocation to participating securities (1) | (2,229) |  |  | (2,119) |  |  | (2,004) |
Numerator for basic and diluted net income available to common unitholders | $ | 187,380 |  |  | $ | 196,619 |  |  | $ | 261,206 |
Denominator: |  |  |  |  |
Basic weighted average vested units outstanding | 115,095,506 |  |  | 105,223,975 |  |  | 102,025,276 |
Effect of dilutive securities | 478,281 |  |  | 648,600 |  |  | 510,006 |
Diluted weighted average vested units and common unit equivalents outstanding | 115,573,787 |  |  | 105,872,575 |  |  | 102,535,282 |
Basic earnings per unit: |  |  |  |  |
Net income available to common unitholders per unit | $ | 1.63 |  |  | $ | 1.87 |  |  | $ | 2.56 |
Diluted earnings per unit: |  |  |  |  |
Net income available to common unitholders per unit | $ | 1.62 |  |  | $ | 1.86 |  |  | $ | 2.55 |
____________________ (1)Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs. Share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are considered participating securities. The impact of potentially dilutive common units, including stock options, RSUs, shares issuable under executed forward equity sale agreements, if any, and other securities are considered in our diluted earnings per share calculation for the years ended December 31, 2020, 2019 and 2018. Certain market measure-based RSUs are not included in dilutive securities as of December 31, 2020, 2019 and 2018 as not all performance metrics had been met by the end of the applicable reporting periods. See Note 15 “Share-Based and Other Compensation” for additional information regarding the stock options and other share-based compensation.

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