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PROPERTY AND EQUIPMENT, NET (Tables) | 9 Months Ended
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Sep. 30, 2017
PROPERTY AND EQUIPMENT, NET. |
Schedule of property and equipment |
|  | As of December 31, 2016 |  | As of September 30, 2017 |
At cost: |  |  |  |  |  |  |
Buildings |  |  | 1,652,641 |  |  | 2,227,168 |
Data center equipment |  |  | 1,349,069 |  |  | 1,712,577 |
Leasehold improvement |  |  | 1,202,979 |  |  | 1,700,203 |
Furniture and office equipment |  |  | 31,270 |  |  | 35,331 |
Vehicles |  |  | 3,199 |  |  | 3,397 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 4,239,158 |  |  | 5,678,676 |
Less: Accumulated depreciation |  |  | (613,658 | ) |  | (857,006 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 3,625,500 |  |  | 4,821,670 |
Construction in progress |  |  | 697,391 |  |  | 1,547,160 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property and equipment, net |  |  | 4,322,891 |  |  | 6,368,830 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of property and equipment under capital lease and other financing arrangement |
|  | As of December 31, 2016 |  | As of September 30, 2017 |
At cost: |  |  |  |  |  |  |
Buildings (note) |  |  | 1,286,079 |  |  | 1,964,535 |
Data center equipment |  |  | 26,375 |  |  | 12,718 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 1,312,454 |  |  | 1,977,253 |
Less: Accumulated depreciation |  |  | (64,151 | ) |  | (114,827 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 1,248,303 |  |  | 1,862,426 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Note: | This item included those buildings under construction, of RMB313,721 and RMB419,177, respectively, as of December 31, 2016 and September 30, 2017.
Schedule of depreciation of property and equipment |
|  | Nine-month periods ended September 30, |
|  | 2016 |  | 2017 |
Cost of revenue |  |  | 142,553 |  |  | 239,581 |
General and administrative expenses |  |  | 3,063 |  |  | 4,895 |
Research and development expenses |  |  | 400 |  |  | 422 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 146,016 |  |  | 244,898 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of reconciliation of total interest costs to "interest expenses" |
|  | Nine-month periods ended September 30, |
|  | 2016 |  | 2017 |
Total interest costs |  |  | 228,636 |  |  | 312,574 |
Less: interest costs capitalized |  |  | (47,300 | ) |  | (38,191 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest expenses |  |  | 181,336 |  |  | 274,383 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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