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Capital | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract] |
Capital | Capital As of March 31, 2018, there were 302,996,359 operating partnership units outstanding, of which 164,369,210, or 54.2%, were owned by ESRT and 138,627,149, or 45.8%, were owned by other partners, including ESRT directors, members of senior management and other employees. Long-term incentive plan ("LTIP") units are a special class of partnership interests. Each LTIP unit awarded will be deemed equivalent to an award of one share of ESRT stock under the First Amended and Restated Empire State Realty Trust, Inc. and Empire State Realty OP, L.P. 2013 Equity Incentive Plan ("2013 Plan"), reducing the availability for other equity awards on a one-for-one basis. The vesting period for LTIP units, if any, will be determined at the time of issuance. Under the terms of the LTIP units, we will revalue for tax purposes its assets upon the occurrence of certain specified events, and any increase in valuation from the time of grant until such event will be allocated first to the holders of LTIP units to equalize the capital accounts of such holders with the capital accounts of unitholders. Subject to any agreed upon exceptions, once vested and having achieved parity with unitholders, LTIP units are convertible into Series PR operating partnership units on a one-for-one basis. LTIP units subject to time based vesting, whether vested or not, receive the same per unit distributions as operating partnership units, which equal per share dividends (both regular and special) on our common stock. Performance based LTIP units receive 10% of such distributions currently, unless and until such LTIP units are earned based on performance, at which time they will receive the accrued and unpaid 90% and will commence receiving 100% of such distributions thereafter. Distributions Total distributions paid to OP unitholders were $31.6 million and $31.4 million for the three months ended March 31, 2018 and 2017, respectively. Total distributions paid to preferred unitholders were $0.2 million and $0.2 million for the three months ended March 31, 2018 and 2017, respectively. Incentive and Share-Based Compensation The 2013 Plan provides for grants to directors, employees and consultants consisting of stock options, restricted stock, dividend equivalents, stock payments, performance shares, LTIP units, stock appreciation rights and other incentive awards. An aggregate of 12.2 million shares of ESRT common stock is authorized for issuance under awards granted pursuant to the 2013 Plan, and as of March 31, 2018, 4.4 million shares of ESRT common stock remain available for future issuance. In March 2018, we made grants of LTIP units to executive officers under the 2013 Plan. At such time, we granted to executive officers a total of 386,876 LTIP units that are subject to time-based vesting and 1,737,917 LTIP units that are subject to performance-based vesting, with fair market values of $6.1 million for the time-based vesting awards and $9.6 million for the performance-based vesting awards. In March 2018, we made grants of LTIP units and restricted stock to certain other employees under the 2013 Plan. At such time, we granted to certain other employees a total of 67,449 LTIP units and 39,608 shares of restricted stock that are subject to time-based vesting and 223,950 LTIP units that are subject to performance-based vesting, with fair market values of $1.7 million for the time-based vesting awards and $1.1 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years from January 1, 2018, subject generally to the grantee's continued employment. The first installment vests on January 1, 2019 and the remainder will vest thereafter in three equal annual installments. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of absolute and relative total stockholder return hurdles over a three-year performance period, commencing on January 1, 2018. Following the completion of the three-year performance period, our compensation committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered into in connection with the award grant. These units then vest in two installments, with the first installment vesting on January 1, 2021 and the second installment vesting on January 1, 2022, subject generally to the grantee's continued employment on those dates. In 2017, our board of directors determined to reinforce the alignment of our executive officers’ interests with that of stockholders by designing a new bonus election program, under which named executive officers could elect to receive their annual incentive bonus in any combination of (i) cash or vested LTIP's at the face amount of such bonus or (ii) time-vesting LTIP's which would vest over three years, subject to continued employment, at 125% of such face amount. In February 2018, we made grants of LTIP units to executive officers under the 2013 Plan in connection with the 2017 bonus election program. We granted to executive officers a total of 238,609 LTIP units that are subject to time based vesting with a fair market value of $4.0 million. Of these LTIP units, 25,158 LTIP units vested immediately on the grant date and 213,451 LTIP units vest ratably over three years from January 1, 2018, subject generally to the grantee's continued employment. The first installment vests on January 1, 2019 and the remainder will vest thereafter in two equal annual installments. Share-based compensation is measured at the fair value of the award on the date of grant and recognized as an expense on a straight-line basis over the vesting period. For the performance-based LTIP units and restricted stock awards, the fair value of the awards was estimated using a Monte Carlo Simulation model. Our stock price, along with the prices of the comparative indexes, is assumed to follow the Geometric Brownian Motion Process. Geometric Brownian Motion is a common assumption when modeling in financial markets, as it allows the modeled quantity (in this case the stock price) to vary randomly from its current value and take any value greater than zero. The volatilities of the returns on our stock price and the comparative indexes were estimated based on implied volatilities and historical volatilities using a six-year look-back period. The expected growth rate of the stock prices over the performance period is determined with consideration of the risk free rate as of the grant date. For LTIP unit awards that are time-based, the fair value of the awards was estimated based on the fair value of our stock at the grant date discounted for the restriction period during which the LTIP units cannot be redeemed or transferred and the uncertainty regarding if, and when, the book capital account of the LTIP units will equal that of the common units. For restricted stock awards that are time-based, we estimate the stock compensation expense based on the fair value of the stock at the grant date. LTIP units and ESRT restricted stock issued during the three months ended March 31, 2018 were valued at $22.6 million. The weighted-average per unit or share fair value was $8.38 for grants issued in 2018. The per unit or share granted in 2018 was estimated on the respective dates of grant using the following assumptions: an expected life of 5.6 years, a dividend rate of 2.30%, a risk-free interest rate of 2.50%, and an expected price volatility of 17.0%. No other stock options, dividend equivalents, or stock appreciation rights were issued or outstanding in 2018. The following is a summary of ESRT restricted stock and LTIP unit activity for the three months ended March 31, 2018:
| Restricted Stock |  | LTIP Units |  | Weighted Average Grant Fair Value
Unvested balance at December 31, 2017 | 90,791 |  |  | 3,588,609 |  |  | $ | 11.20 |
Vested | (28,123 | ) |  | (437,558 | ) |  | 14.19 |
Granted | 39,608 |  |  | 2,654,801 |  |  | 8.38 |
Forfeited or unearned | (6,101 | ) |  | (94,173 | ) |  | 8.39 |
Unvested balance at March 31, 2018 | 96,175 |  |  | 5,711,679 |  |  | $ | 9.70 |
The LTIP unit and ESRT restricted stock awards will immediately vest upon the later of (i) the date the grantee attains the age of 60 and (ii) the date on which grantee has first completed ten years of continuous service with our company or its affiliates. For award agreements that qualify, we recognize noncash compensation expense on the grant date for the time-based awards and ratably over the vesting period for the performance-based awards, and accordingly, we recognized $1.2 million and $0.6 million for the three months ended March 31, 2018 and 2017, respectively. Unrecognized compensation expense was $1.3 million at March 31, 2018, which will be recognized over a weighted average period of 2.6 years. For the remainder of the LTIP unit and ESRT restricted stock awards, we recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized noncash compensation expense of $3.4 million and $2.6 million for the three months ended March 31, 2018 and 2017, respectively. Unrecognized compensation expense was $40.5 million at March 31, 2018, which will be recognized over a weighted average period of 2.7 years. Earnings Per Unit Earnings per unit for the three months ended March 31, 2018 and 2017 is computed as follows (amounts in thousands, except per share amounts):
| Three Months Ended,
| March 31, 2018 |  | March 31, 2017
Numerator: |  |  |
Net income | $ | 18,058 |  |  | $ | 19,145 |
Private perpetual preferred unit distributions | (234 | ) |  | (234 | )
Earnings allocated to unvested units | (162 | ) |  | (154 | )
Net income attributable to common unitholders - basic and diluted | $ | 17,662 |  |  | $ | 18,757 |
Denominator: |  |  |
Weighted average units outstanding - basic | 296,824 |  |  | 296,388 |
Effect of dilutive securities: |  |  |
Stock-based compensation plans | 3 |  |  | 775 |
Exchangeable senior notes | — |  |  | 799 |
Weighted average units outstanding - diluted | 296,827 |  |  | 297,962 |
Earnings per share: |  |  |
Basic | $ | 0.06 |  |  | $ | 0.06 |
Diluted | $ | 0.06 |  |  | $ | 0.06 |
There were 419,347 and 622,565 antidilutive units for the three months ended March 31, 2018 and 2017, respectively.

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- Definition Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract] + References No definition available. + Details
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- Definition Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Text Block] + References No definition available. + Details
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