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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Value of Initial Fixed $100 Investment Based On: | ​ | ​ | ​ | ​
Year | ​ | Summary Compensation Table Total for PEO (1) ($) | ​ | Compensation Actually Paid to PEO (2) ($) | ​ | Average Summary Compensation Table Total for Non-PEO NEOs (3) ($) | ​ | Average Compensation Actually Paid to Non-PEO NEOs (4) ($) | ​ | Total Stockholder Return (5) ($) | ​ | Peer Group Total Stockholder Return (6) ($) | ​ | Net Loss (7) ($ thousands) | ​ | Company Selected Measure: NOI (8) ($ thousands)
2024 | ​ | 4,447,497 | ​ | 6,804,616 | ​ | 1,779,411 | ​ | 2,252,036 | ​ | 42 | ​ | 75 | ​ | (46,288) | ​ | 363,863
2023 | ​ | 20,793,396 | ​ | 16,274,237 | ​ | 5,946,176 | ​ | 4,937,703 | ​ | 44 | ​ | 62 | ​ | (259,744) | ​ | 357,972
2022 |  | 9,752,312 |  | 8,473,587 | ​ | 2,997,166 | ​ | 2,201,029 | ​ | 48 | ​ | 61 | ​ | (36,403) | ​ | 373,225
2021 | ​ | 9,746,050 | ​ | 6,593,381 | ​ | 3,462,015 | ​ | 2,980,168 | ​ | 65 | ​ | 97 | ​ | (20,354) | ​ | 360,446
2020 | ​ | 9,297,893 | ​ | 3,942,462 | ​ | 2,484,614 | ​ | 1,131,946 | ​ | 68 | ​ | 80 | ​ | (24,704) | ​ | 374,872
​
(1) | Reflects the compensation amounts reported in the SCT for our PEO, Mr. Behler, for each of the respective years shown.
(2) | CAP to our PEO is computed in accordance with SEC rules. The dollar amounts do not reflect the actual amount of compensation earned or paid during the applicable year. In accordance with SEC rules, reconciliation of the adjustments made from SCT total compensation to CAP for Mr. Behler is set forth following the footnotes to this table.
(3) | For 2024, 2023 and 2022, Other NEOs are Messrs. Paes, Brindley, and Johnson; for 2021 and 2020, Other NEOs are Messrs. Paes, Brindley, Johnson and Mr. David Zobel, former Executive Vice President, Head of Acquisitions.
(4) | Average CAP to our Other NEOs is computed in accordance with SEC rules. The dollar amounts do not reflect the actual amount of compensation earned or paid during the applicable year. In accordance with SEC rules, reconciliation of the adjustments made from SCT total compensation to CAP for the average of the Other NEOs is set forth following the footnotes to this table.
(5) | Represents the cumulative TSR of the Company for an initial investment of $100 on December 31, 2019 through and including the end of the fiscal year for each row in the table.
(6) | Represents the cumulative TSR of the MSCI US REIT/Office REIT Index, which is an industry index reported in the performance graph included in the Company’s 2024 Annual Report on Form 10-K, for an initial investment of $100 on December 31, 2019 through and including the end of the fiscal year for each row in the table.
(7) | The Company’s Net Income as reported in the Company’s Consolidated Statements of Income on Form 10-K for each fiscal year in the table.
(8) | The Company’s NOI, which is the Company-Selected Measure, and a non-GAAP measure discussed in our Form 10-K filing.
Company Selected Measure Name | NOI |  |  |  |
Named Executive Officers, Footnote |
(1) | Reflects the compensation amounts reported in the SCT for our PEO, Mr. Behler, for each of the respective years shown.
(3) | For 2024, 2023 and 2022, Other NEOs are Messrs. Paes, Brindley, and Johnson; for 2021 and 2020, Other NEOs are Messrs. Paes, Brindley, Johnson and Mr. David Zobel, former Executive Vice President, Head of Acquisitions.
Peer Group Issuers, Footnote |
(6) | Represents the cumulative TSR of the MSCI US REIT/Office REIT Index, which is an industry index reported in the performance graph included in the Company’s 2024 Annual Report on Form 10-K, for an initial investment of $100 on December 31, 2019 through and including the end of the fiscal year for each row in the table.
PEO Total Compensation Amount | $ 4,447,497 | $ 20,793,396 | $ 9,752,312 | $ 9,746,050 | $ 9,297,893
PEO Actually Paid Compensation Amount | $ 6,804,616 | 16,274,237 | 8,473,587 | 6,593,381 | 3,942,462
Adjustment To PEO Compensation, Footnote |
(2) | CAP to our PEO is computed in accordance with SEC rules. The dollar amounts do not reflect the actual amount of compensation earned or paid during the applicable year. In accordance with SEC rules, reconciliation of the adjustments made from SCT total compensation to CAP for Mr. Behler is set forth following the footnotes to this table.
Reconciliation of SCT Total Compensation to CAP
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | Average | ​ | ​ | Average | ​ | ​ | Average | ​ | ​ | Average | ​ | ​ | Average
​ | ​ | ​ | Other | ​ | ​ | Other | ​ | ​ | Other | ​ | ​ | Other | ​ | ​ | Other
​ | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO
​ | ​ | PEO | NEOs | ​ | PEO | NEOs | ​ | PEO | NEOs | ​ | PEO | NEOs | ​ | PEO | NEOs
​ | ​ | ($) | ($) | ​ | ($) | ($) | ​ | ($) | ($) | ​ | ($) | ($) | ​ | ($) | ($)
Summary Compensation Table Total | ​ | 4,447,497 | 1,779,411 | ​ | 20,793,396 | 5,946,176 | ​ | 9,752,312 | 2,997,166 | ​ | 9,746,050 | 3,462,015 | ​ | 9,297,893 | 2,484,614
Add (Subtract): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock award and option value | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
reported in SCT for the covered year | ​ | - | (16,667) | ​ | (17,250,000) | (4,539,584) | ​ | (6,250,000) | (1,569,167) | ​ | (6,250,000) | (2,041,875) | ​ | (6,524,028) | (1,401,453)
Year-end fair value of equity awards | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
granted during fiscal year that are outstanding | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
and unvested at year-end | ​ | 1,124,531 | 245,569 | ​ | 15,897,136 | 4,217,542 | ​ | 5,714,133 | 1,301,013 | ​ | 5,985,523 | 1,987,166 | ​ | 3,864,110 | 818,366
Year-over-Year change in fair value of awards | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
granted in any prior fiscal year that are | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
outstanding and unvested at year-end | ​ | 902,350 | 186,881 | ​ | (1,244,065) | (420,203) | ​ | (881,161) | (656,817) | ​ | (1,195,684) | (248,814) | ​ | (2,080,515) | (664,014)
Change in fair value from prior year-end to | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
vesting date of awards granted in any prior | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
year that vested during the fiscal year | ​ | 100,345 | (29,146) | ​ | (2,167,379) | (376,547) | ​ | (62,571) | 18,256 | ​ | (1,867,338) | (252,966) | ​ | (869,466) | (177,521)
Value of dividends or other earnings paid on | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
unvested T-LTIP units not otherwise reflected | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
in fair value or total compensation | ​ | 229,893 | 85,988 | ​ | 245,149 | 110,319 | ​ | 200,874 | 110,578 | ​ | 174,830 | 74,642 | ​ | 254,468 | 71,954
Compensation Actually Paid | ​ | 6,804,616 | 2,252,036 | ​ | 16,274,237 | 4,937,703 | ​ | 8,473,587 | 2,201,029 | ​ | 6,593,381 | 2,980,168 | ​ | 3,942,462 | 1,131,946
​ The dollar amounts reported represent CAP, as computed in accordance with SEC rules. The fair values of stock option and AOLTIP awards were determined using a Black-Scholes option-pricing model with assumptions applicable to each valuation date. The fair values of performance-based LTIP awards were determined using a Monte Carlo simulation analysis, and for awards tied to NOI goals, assume approximately target performance for NOI. The fair value of time-based LTIP awards were based on the Company’s closing stock price on each valuation date. Fair value changes for stock options, AOLTIP units and performance-based LTIP awards between valuation dates may not be aligned with stock price movement due to differences in parameters utilized in the valuation model such as a higher or lower stock price volatility. The dollar amounts do not reflect the actual amount of compensation earned by or paid during the applicable year. |  |  |  |
Non-PEO NEO Average Total Compensation Amount | $ 1,779,411 | 5,946,176 | 2,997,166 | 3,462,015 | 2,484,614
Non-PEO NEO Average Compensation Actually Paid Amount | $ 2,252,036 | 4,937,703 | 2,201,029 | 2,980,168 | 1,131,946
Adjustment to Non-PEO NEO Compensation Footnote |
(4) | Average CAP to our Other NEOs is computed in accordance with SEC rules. The dollar amounts do not reflect the actual amount of compensation earned or paid during the applicable year. In accordance with SEC rules, reconciliation of the adjustments made from SCT total compensation to CAP for the average of the Other NEOs is set forth following the footnotes to this table.
Reconciliation of SCT Total Compensation to CAP
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | Average | ​ | ​ | Average | ​ | ​ | Average | ​ | ​ | Average | ​ | ​ | Average
​ | ​ | ​ | Other | ​ | ​ | Other | ​ | ​ | Other | ​ | ​ | Other | ​ | ​ | Other
​ | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO | ​ | ​ | Non-PEO
​ | ​ | PEO | NEOs | ​ | PEO | NEOs | ​ | PEO | NEOs | ​ | PEO | NEOs | ​ | PEO | NEOs
​ | ​ | ($) | ($) | ​ | ($) | ($) | ​ | ($) | ($) | ​ | ($) | ($) | ​ | ($) | ($)
Summary Compensation Table Total | ​ | 4,447,497 | 1,779,411 | ​ | 20,793,396 | 5,946,176 | ​ | 9,752,312 | 2,997,166 | ​ | 9,746,050 | 3,462,015 | ​ | 9,297,893 | 2,484,614
Add (Subtract): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock award and option value | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
reported in SCT for the covered year | ​ | - | (16,667) | ​ | (17,250,000) | (4,539,584) | ​ | (6,250,000) | (1,569,167) | ​ | (6,250,000) | (2,041,875) | ​ | (6,524,028) | (1,401,453)
Year-end fair value of equity awards | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
granted during fiscal year that are outstanding | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
and unvested at year-end | ​ | 1,124,531 | 245,569 | ​ | 15,897,136 | 4,217,542 | ​ | 5,714,133 | 1,301,013 | ​ | 5,985,523 | 1,987,166 | ​ | 3,864,110 | 818,366
Year-over-Year change in fair value of awards | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
granted in any prior fiscal year that are | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
outstanding and unvested at year-end | ​ | 902,350 | 186,881 | ​ | (1,244,065) | (420,203) | ​ | (881,161) | (656,817) | ​ | (1,195,684) | (248,814) | ​ | (2,080,515) | (664,014)
Change in fair value from prior year-end to | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
vesting date of awards granted in any prior | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
year that vested during the fiscal year | ​ | 100,345 | (29,146) | ​ | (2,167,379) | (376,547) | ​ | (62,571) | 18,256 | ​ | (1,867,338) | (252,966) | ​ | (869,466) | (177,521)
Value of dividends or other earnings paid on | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
unvested T-LTIP units not otherwise reflected | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
in fair value or total compensation | ​ | 229,893 | 85,988 | ​ | 245,149 | 110,319 | ​ | 200,874 | 110,578 | ​ | 174,830 | 74,642 | ​ | 254,468 | 71,954
Compensation Actually Paid | ​ | 6,804,616 | 2,252,036 | ​ | 16,274,237 | 4,937,703 | ​ | 8,473,587 | 2,201,029 | ​ | 6,593,381 | 2,980,168 | ​ | 3,942,462 | 1,131,946
​ The dollar amounts reported represent CAP, as computed in accordance with SEC rules. The fair values of stock option and AOLTIP awards were determined using a Black-Scholes option-pricing model with assumptions applicable to each valuation date. The fair values of performance-based LTIP awards were determined using a Monte Carlo simulation analysis, and for awards tied to NOI goals, assume approximately target performance for NOI. The fair value of time-based LTIP awards were based on the Company’s closing stock price on each valuation date. Fair value changes for stock options, AOLTIP units and performance-based LTIP awards between valuation dates may not be aligned with stock price movement due to differences in parameters utilized in the valuation model such as a higher or lower stock price volatility. The dollar amounts do not reflect the actual amount of compensation earned by or paid during the applicable year. |  |  |  |
Compensation Actually Paid vs. Total Shareholder Return | Relationship between Company CAP and TSR The graphs below illustrate the relationship between CAP and our TSR for the PEO (top) and Average Other NEOs (bottom) for each of the past five fiscal years. SCT total compensation is also shown for reference. Note that the FY2023 values include the grant date fair value (SCT) and the fair value as of December 31, 2023 (CAP) for the Incentive and Retention Plan awards, which were intended to replace the 2024 and 2025 annual equity awards. ​ |  |  |  |
Compensation Actually Paid vs. Net Income | ​ Relationship between CAP, Net Loss, and NOI The graph below illustrates the relationship between the CAP values for the PEO and Average Other NEOs and our Net Income (Loss) and NOI. Net Income (Loss) is not used as a metric in our annual or long-term incentive plans, and NOI is used in our long-term incentive plan. Note that the FY2023 CAP values include the fair value as of December 31, 2023 for the Incentive and Retention Plan awards, which were intended to replace the 2024 and 2025 annual equity awards. |  |  |  |
Compensation Actually Paid vs. Company Selected Measure | ​ Relationship between CAP, Net Loss, and NOI The graph below illustrates the relationship between the CAP values for the PEO and Average Other NEOs and our Net Income (Loss) and NOI. Net Income (Loss) is not used as a metric in our annual or long-term incentive plans, and NOI is used in our long-term incentive plan. Note that the FY2023 CAP values include the fair value as of December 31, 2023 for the Incentive and Retention Plan awards, which were intended to replace the 2024 and 2025 annual equity awards. ​ |  |  |  |
Total Shareholder Return Vs Peer Group | Relationship between the Company’s TSR and Peer Group TSR The graph below illustrates the relationship between our five-year cumulative TSR and that of the MSCI US REIT/Office REIT Index, which is the “Peer Group” used in the pay-versus-performance table above. |  |  |  |
Tabular List, Table | Tabular List of Performance Measures The following is a list of performance measures, which in our assessment represent the most important performance measures used by the Company to link compensation actually paid to the NEOs for 2024. Each metric below is used for purposes of determining payouts under either our annual incentive program or vesting of our performance stock units. Please see the CD&A for a further description of these metrics and how they are used in the Company’s executive compensation program. ​
| ● | NOI
| ● | Relative TSR
| ● | Core FFO Per Share
| ● | Square Footage of Signed Leases
| ● | Same Store Leased Occupancy
| ● | Corporate Overhead (general and administrative expenses)
| ● | Fundraising (value of capital raised through funds and joint ventures)
​ NOI is the primary performance metric used to determine payout of LTIP units awarded under our typical long-term incentive compensation program. |  |  |  |
Total Shareholder Return Amount | $ 42 | 44 | 48 | 65 | 68
Peer Group Total Shareholder Return Amount | 75 | 62 | 61 | 97 | 80
Net Income (Loss) | $ (46,288,000) | $ (259,744,000) | $ (36,403,000) | $ (20,354,000) | $ (24,704,000)
Company Selected Measure Amount | 363,863,000 | 357,972,000 | 373,225,000 | 360,446,000 | 374,872,000
PEO Name | Mr. Behler |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | NOI |  |  |  |
Non-GAAP Measure Description |
(8) | The Company’s NOI, which is the Company-Selected Measure, and a non-GAAP measure discussed in our Form 10-K filing.
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Relative TSR |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core FFO Per Share |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Square Footage of Signed Leases |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Same Store Leased Occupancy |  |  |  |
Measure:: 6 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Corporate Overhead (general and administrative expenses) |  |  |  |
Measure:: 7 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Fundraising (value of capital raised through funds and joint ventures) |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | $ (17,250,000) | $ (6,250,000) | $ (6,250,000) | $ (6,524,028)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 1,124,531 | 15,897,136 | 5,714,133 | 5,985,523 | 3,864,110
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 902,350 | (1,244,065) | (881,161) | (1,195,684) | (2,080,515)
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 100,345 | (2,167,379) | (62,571) | (1,867,338) | (869,466)
PEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 229,893 | 245,149 | 200,874 | 174,830 | 254,468
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (16,667) | (4,539,584) | (1,569,167) | (2,041,875) | (1,401,453)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 245,569 | 4,217,542 | 1,301,013 | 1,987,166 | 818,366
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 186,881 | (420,203) | (656,817) | (248,814) | (664,014)
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (29,146) | (376,547) | 18,256 | (252,966) | (177,521)
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 85,988 | $ 110,319 | $ 110,578 | $ 74,642 | $ 71,954

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