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Consolidated Statements of Equity (Unaudited) - USD ($) | Total | Total Stockholders’ Equity | Common Stock | Additional Paid-In Capital | Cumulative Distributions | Accumulated (Deficit) Earnings | Accumulated Other Comprehensive Loss | Non- controlling Interests | Griffin Capital Essential Asset REIT, Inc. [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] Total Stockholders’ Equity | Griffin Capital Essential Asset REIT, Inc. [Member] Common Stock | Griffin Capital Essential Asset REIT, Inc. [Member] Additional Paid-In Capital | Griffin Capital Essential Asset REIT, Inc. [Member] Cumulative Distributions | Griffin Capital Essential Asset REIT, Inc. [Member] Accumulated (Deficit) Earnings | Griffin Capital Essential Asset REIT, Inc. [Member] Accumulated Other Comprehensive Loss | Griffin Capital Essential Asset REIT, Inc. [Member] Non- controlling Interests
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BALANCE at Dec. 31, 2014 | $ 9,479,000 | $ 9,340,000 | $ 11,000 | $ 9,838,000 | $ (72,000) | $ (437,000) | $ 0 | $ 139,000 | $ 990,985,000 | $ 973,507,000 | $ 1,326,000 | $ 1,128,318,000 | $ (104,429,000) | $ (51,285,000) | $ (423,000) | $ 17,478,000
BALANCE (in shares) at Dec. 31, 2014 |  |  | 1,133,773 |  |  |  |  |  |  |  | 129,763,016 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for SOR Merger |  |  |  |  |  |  |  |  | 433,667,000 | 433,667,000 | $ 42,000 | 433,625,000 |  |  |  |
Issuance of common stock for SOR Merger (shares) |  |  |  |  |  |  |  |  |  |  | 41,764,968 |  |  |  |  |
Adjustment to par value |  |  |  |  |  |  |  |  | 0 | 0 | $ (1,217,000) | 1,217,000 |  |  |  |
Adjustments to redemption value of redeemable noncontrolling interest |  |  |  |  |  |  |  |  | (10,473,000) | (10,473,000) |  | (10,473,000) |  |  |  |
Gross proceeds from issuance of common stock | 268,973,000 | 268,973,000 | $ 16,000 | 268,957,000 |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock (shares) |  |  | 26,897,208 |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on issuance of common stock | (997,000) | (997,000) |  | (997,000) |  |  |  |  |  |  |  |  |  |  |  |
Deferred equity compensation |  |  |  |  |  |  |  |  | 12,000 | 12,000 |  | 12,000 |  |  |  |
Deferred equity compensation (in shares) |  |  |  |  |  |  |  |  |  |  | 667 |  |  |  |  |
Distributions to common stockholders | (3,173,000) | (3,173,000) |  |  | (3,173,000) |  |  |  | (55,045,000) | (55,045,000) |  |  | (55,045,000) |  |  |
Issuance of shares for distribution reinvestment plan |  |  | $ 2,000 | 4,535,000 | (4,537,000) |  |  |  | 52,557,000 |  | $ 28,000 | 52,529,000 | (52,557,000) |  |  |
Issuance of shares for distribution reinvestment plan (in shares) |  |  | 477,638 |  |  |  |  |  |  |  | 5,053,669 |  |  |  |  |
Issuance of stock dividend (in shares) |  |  | 47,551 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock dividend |  |  |  | 476,000 | (476,000) |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (13,819,000) | (13,819,000) | $ (4,000) | (13,815,000) |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (1,397,801) |  |  |  |  |
Additions to noncontrolling interests subject to redemption | (375,000) | (375,000) |  |  | (375,000) |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests |  |  |  |  |  |  |  | (11,000) | (3,150,000) |  |  |  |  |  |  | (3,150,000)
Issuance of limited partnership units |  |  |  |  |  |  |  |  | 7,282,000 |  |  |  |  |  |  | 7,282,000
Distributions to noncontrolling interests subject to redemption |  |  |  |  |  |  |  |  | (10,000) |  |  |  |  |  |  | (10,000)
Offering costs on preferred shares | (27,514,000) | (27,514,000) |  | (27,514,000) |  |  |  |  | (62,000) | (62,000) |  | (62,000) |  |  |  |
Additions to common stock subject to redemption | (4,538,000) | (4,538,000) |  | (4,538,000) |  |  |  |  | (35,232,000) | (35,232,000) |  | (35,232,000) |  |  |  |
Noncontrolling Interest, Increase for Offering Costs and Distributions to Noncontrolling Interest Holders | 364,000 | 375,000 |  |  | 375,000 |  |  | (11,000) | 5,380,000 | 5,380,000 |  | 5,380,000 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Distributions to Redeemable Preferred Units, and Preferred Unit Redemption Charges | (17,277,000) | (17,247,000) |  |  |  | (17,247,000) |  | (30,000) |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (3,888,000) | (3,750,000) |  |  |  | (3,750,000) |  | (138,000)
Other comprehensive income |  |  |  |  |  |  |  |  | (6,560,000) | (6,416,000) |  |  |  |  | (6,416,000) | (144,000)
BALANCE at Dec. 31, 2015 | 224,942,000 | 224,844,000 | $ 29,000 | 250,757,000 | (8,258,000) | (17,684,000) | 0 | 98,000 | 1,309,087,000 | 1,287,769,000 | $ 175,000 | 1,561,499,000 | (212,031,000) | (55,035,000) | (6,839,000) | 21,318,000
BALANCE (in shares) at Dec. 31, 2015 |  |  | 28,556,170 |  |  |  |  |  |  |  | 175,184,519 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | 406,463,000 | 406,463,000 | $ 40,000 | 406,423,000 |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock (shares) |  |  | 40,700,406 |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on issuance of common stock | (696,000) | (696,000) |  | (696,000) |  |  |  |  |  |  |  |  |  |  |  |
Deferred equity compensation |  |  |  |  |  |  |  |  | 18,000 | 18,000 |  | 18,000 |  |  |  |
Deferred equity compensation (in shares) |  |  |  |  |  |  |  |  |  |  | 1,333 |  |  |  |  |
Distributions to common stockholders | (12,479,000) | (12,479,000) |  |  | (12,479,000) |  |  |  | (69,624,000) | (69,624,000) |  |  | (69,624,000) |  |  |
Issuance of shares for distribution reinvestment plan |  |  | $ 2,000 | 15,157,000 | (15,159,000) |  |  |  | 52,174,000 |  | $ 5,000 | 52,169,000 | (52,174,000) |  |  |
Issuance of shares for distribution reinvestment plan (in shares) |  |  | 1,599,355 |  |  |  |  |  |  |  | 5,011,974 |  |  |  |  |
Issuance of stock dividend (in shares) |  |  | 251,158 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock dividend |  |  |  | 2,510,000 | (2,510,000) |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (41,443,000) | (41,443,000) | $ (4,000) | (41,439,000) |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (4,164,955) |  |  |  |  |
Repurchase of common stock | (1,627,000) | (1,627,000) |  | (1,627,000) |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | (167,442) |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (11,000) |  |  |  |  |  |  | (11,000) | (4,124,000) |  |  |  |  |  |  | (4,124,000)
Issuance of limited partnership units |  |  |  |  |  |  |  |  | 11,941,000 |  |  |  |  |  |  | 11,941,000
Distributions to noncontrolling interests subject to redemption |  |  |  |  |  |  |  |  | (11,000) |  |  |  |  |  |  | (11,000)
Offering costs on preferred shares | (43,340,000) | (43,340,000) |  | (43,340,000) |  |  |  |  |  |  |  |  |  |  |  |
Additions to common stock subject to redemption | (13,531,000) | (13,531,000) |  | (13,531,000) |  |  |  |  | (10,731,000) | (10,731,000) |  | (10,731,000) |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Distributions to Redeemable Preferred Units, and Preferred Unit Redemption Charges | (6,107,000) | (6,104,000) |  |  |  | (6,104,000) |  | (3,000) |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 26,197,000 | 25,285,000 |  |  |  | 25,285,000 |  | 912,000
Other comprehensive income | 841,000 | 841,000 |  |  |  |  | 841,000 |  | 2,274,000 | 2,196,000 |  |  |  |  | 2,196,000 | 78,000
BALANCE at Dec. 31, 2016 | $ 554,455,000 | 554,371,000 | $ 71,000 | 615,653,000 | (38,406,000) | (23,788,000) | 841,000 | 84,000 | $ 1,223,584,000 | 1,193,470,000 | $ 176,000 | 1,561,516,000 | (333,829,000) | (29,750,000) | (4,643,000) | 30,114,000
BALANCE (in shares) at Dec. 31, 2016 | 70,939,647 |  | 70,939,647 |  |  |  |  |  | 176,032,871 |  | 176,032,871 |  |  |  |  |
BALANCE at Dec. 31, 2015 | $ 224,942,000 | 224,844,000 | $ 29,000 | 250,757,000 | (8,258,000) | (17,684,000) | 0 | 98,000 | $ 1,309,087,000 | 1,287,769,000 | $ 175,000 | 1,561,499,000 | (212,031,000) | (55,035,000) | (6,839,000) | 21,318,000
BALANCE (in shares) at Dec. 31, 2015 |  |  | 28,556,170 |  |  |  |  |  |  |  | 175,184,519 |  |  |  |  |
BALANCE at Dec. 31, 2017 | $ 562,544,000 | 562,468,000 | $ 76,000 | 656,705,000 | (82,590,000) | (12,672,000) | 949,000 | 76,000 | $ 1,251,811,000 | 1,220,706,000 | $ 171,000 | 1,561,694,000 | (454,526,000) | 110,907,000 | 2,460,000 | 31,105,000
BALANCE (in shares) at Dec. 31, 2017 | 77,175,283 |  | 77,175,283 |  |  |  |  |  | 170,906,111 |  | 170,906,111 |  |  |  |  |
BALANCE at Dec. 31, 2016 | $ 554,455,000 | 554,371,000 | $ 71,000 | 615,653,000 | (38,406,000) | (23,788,000) | 841,000 | 84,000 | $ 1,223,584,000 | 1,193,470,000 | $ 176,000 | 1,561,516,000 | (333,829,000) | (29,750,000) | (4,643,000) | 30,114,000
BALANCE (in shares) at Dec. 31, 2016 | 70,939,647 |  | 70,939,647 |  |  |  |  |  | 176,032,871 |  | 176,032,871 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 41,826,000 | 41,826,000 | $ 4,000 | 41,822,000 |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock (shares) |  |  | 4,205,673 |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on issuance of common stock | (16,000) | (16,000) |  | (16,000) |  |  |  |  |  |  |  |  |  |  |  |
Deferred equity compensation |  |  |  |  |  |  |  |  | $ 173,000 | 173,000 |  | 173,000 |  |  |  |
Deferred equity compensation (in shares) |  |  |  |  |  |  |  |  |  |  | 13,000 |  |  |  |  |
Distributions to common stockholders | (19,427,000) | (19,427,000) |  |  | (19,427,000) |  |  |  | (71,156,000) | (71,156,000) |  |  | (71,156,000) |  |  |
Issuance of shares for distribution reinvestment plan |  | 0 | $ 2,000 | 22,206,000 | (22,208,000) |  |  |  | 49,541,000 | 0 | $ 5,000 | 49,536,000 | (49,541,000) |  |  |
Issuance of shares for distribution reinvestment plan (in shares) |  |  | 2,358,188 |  |  |  |  |  |  |  | 4,791,485 |  |  |  |  |
Issuance of stock dividend (in shares) |  |  | 269,774 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock dividend | 0 | 0 | $ 0 | 2,549,000 | (2,549,000) |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (98,906,000) | (98,906,000) | $ (10,000) | (98,896,000) |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (9,931,245) |  |  |  |  |
Stock-based compensation | 292,000 | 292,000 |  | 292,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | 25,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | (5,742,000) | (5,742,000) | $ (1,000) | (5,741,000) |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | (623,499) |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of common stock subject to redemption |  |  |  |  |  |  |  |  | 49,365,000 | 49,365,000 |  | 49,365,000 |  |  |  |
Issuance of limited partnership units |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (11,000) |  |  |  |  |  |  | (11,000) | (4,369,000) | 0 |  |  |  |  |  | (4,369,000)
Issuance of limited partnership units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Distributions to noncontrolling interests subject to redemption |  |  |  |  |  |  |  |  | (13,000) | 0 |  |  |  |  |  | (13,000)
Offering costs on preferred shares | (3,593,000) | (3,593,000) |  | (3,593,000) |  |  |  |  |  |  |  |  |  |  |  |
Additions to common stock subject to redemption | (16,467,000) | (16,467,000) |  | (16,467,000) |  |  |  |  | 49,365,000 | 49,365,000 |  | 49,365,000 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Distributions to Redeemable Preferred Units, and Preferred Unit Redemption Charges | 11,119,000 | 11,116,000 |  |  |  | 11,116,000 |  | 3,000 |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 145,777,000 | 140,657,000 |  |  |  | 140,657,000 |  | 5,120,000
Other comprehensive income | 108,000 | 108,000 |  |  |  |  | 108,000 |  | 7,356,000 | 7,103,000 |  |  |  |  | 7,103,000 | 253,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
BALANCE at Dec. 31, 2017 | $ 562,544,000 | 562,468,000 | $ 76,000 | 656,705,000 | (82,590,000) | (12,672,000) | 949,000 | 76,000 | $ 1,251,811,000 | 1,220,706,000 | $ 171,000 | 1,561,694,000 | (454,526,000) | 110,907,000 | 2,460,000 | 31,105,000
BALANCE (in shares) at Dec. 31, 2017 | 77,175,283 |  | 77,175,283 |  |  |  |  |  | 170,906,111 |  | 170,906,111 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 7,430,000 | 7,430,000 | $ 1,000 | 7,429,000 |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock (shares) |  |  | 762,537 |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in redeemable common stock | (5,292,000) | (5,292,000) |  | (5,292,000) |  |  |  |  |  |  |  |  |  |  |  |
Discount on issuance of common stock | (1,000) | (1,000) |  | (1,000) |  |  |  |  |  |  |  |  |  |  |  |
Deferred equity compensation |  |  |  |  |  |  |  |  | $ 37,000 | 37,000 |  | 37,000 |  |  |  |
Deferred equity compensation (in shares) |  |  |  |  |  |  |  |  |  |  | 7,667 |  |  |  |  |
Distributions to common stockholders | (15,498,000) | (15,498,000) |  |  | (15,498,000) |  |  |  | (53,720,000) | (53,720,000) |  |  | (53,720,000) |  |  |
Issuance of shares for distribution reinvestment plan | 0 | 0 | $ 2,000 | 16,420,000 | (16,422,000) |  |  |  | 33,667,000 | 0 | $ 3,000 | 33,664,000 | (33,667,000) |  |  |
Issuance of shares for distribution reinvestment plan (in shares) |  |  | 1,712,265 |  |  |  |  |  |  |  | 3,353,277 |  |  |  |  |
Issuance of stock dividend (in shares) |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (76,912,000) | (76,912,000) | $ (8,000) | (76,904,000) |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (8,013,521) |  |  |  |  |
Stock-based compensation | 44,000 | 44,000 |  | 44,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | 10,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | (18,900,000) | (18,900,000) | $ (2,000) | (18,898,000) |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | (2,000,321) |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of common stock subject to redemption |  |  |  |  |  |  |  |  | 43,245,000 | 43,245,000 |  | 43,245,000 |  |  |  |
Issuance of limited partnership units | 1,185,000 |  |  |  |  |  |  | 1,185,000 |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (50,000) |  |  |  |  |  |  | (50,000) | (3,267,000) |  |  |  |  |  |  | (3,267,000)
Distributions to noncontrolling interests subject to redemption |  |  |  |  |  |  |  |  | (10,000) |  |  |  |  |  |  | (10,000)
Offering costs on preferred shares | (1,129,000) | (1,129,000) |  | (1,129,000) |  |  |  |  | (4,727,000) | (4,727,000) |  | (4,727,000) |  |  |  |
Additions to common stock subject to redemption | 2,478,000 | 2,478,000 |  | 2,478,000 |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Distributions to Redeemable Preferred Units, and Preferred Unit Redemption Charges | (431,000) | (430,000) |  |  |  | (430,000) |  | (1,000) |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 17,275,000 | 16,604,000 |  |  |  | 16,604,000 |  | 671,000
Other comprehensive income | (641,000) | (639,000) |  |  |  |  | (639,000) | (2,000) | 7,500,000 | 7,276,000 |  |  |  | 0 | 7,276,000 | 224,000
BALANCE at Sep. 30, 2018 | $ 531,739,000 | $ 530,531,000 | $ 77,000 | $ 657,756,000 | $ (114,510,000) | $ (13,102,000) | $ 310,000 | $ 1,208,000 | $ 1,181,232,000 | $ 1,152,509,000 | $ 166,000 | $ 1,557,009,000 | $ (541,913,000) | $ 127,511,000 | $ 9,736,000 | $ 28,723,000
BALANCE (in shares) at Sep. 30, 2018 | 77,660,266 |  | 77,660,266 |  |  |  |  |  | 166,253,534 |  | 166,253,534 |  |  |  |  |

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