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Gain on sale of development properties (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Feb. 27, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Feb. 28, 2019
CNY (¥)
Gain on sale of development properties [Line Items]            
Total gross asset value to be disposed to Core Fund ¥ 10,900,000          
Gain on sale of development properties   $ 558,004 ¥ 3,884,709  
The initial annual rent under the lease agreements ¥ 700,000          
Percentage of lease and rent expense increase annually 3.00%          
Rental rate adjusted with growth rate of fair market rent 5 years          
Minimum            
Gain on sale of development properties [Line Items]            
Lease term 5 years          
Maximum            
Gain on sale of development properties [Line Items]            
Lease term 6 years          
Core Fund            
Gain on sale of development properties [Line Items]            
Gain on sale of development properties     ¥ 3,801,492      
Total committed capital           ¥ 4,800,000
Core Fund | General partner            
Gain on sale of development properties [Line Items]            
Committed percentage of the total capital (as a percent)           20.00%
Core Fund | GIC            
Gain on sale of development properties [Line Items]            
Committed percentage of the total capital (as a percent)           80.00%