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PROPERTY AND EQUIPMENT, NET (Details) - CNY (¥) ¥ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Property and equipment |  |
Property and equipment, gross | ¥ 5,678,676 | ¥ 4,239,158
Less: Accumulated depreciation | (857,006) | (613,658)
Property and equipment net excluding construction in progress | 4,821,670 | 3,625,500
Construction in progress | 1,547,160 | 697,391
Property and equipment, net | 6,368,830 | 4,322,891
Buildings |  |
Property and equipment |  |
Property and equipment, gross | 2,227,168 | 1,652,641
Data center equipment |  |
Property and equipment |  |
Property and equipment, gross | 1,712,577 | 1,349,069
Leasehold improvement |  |
Property and equipment |  |
Property and equipment, gross | 1,700,203 | 1,202,979
Furniture and office equipment |  |
Property and equipment |  |
Property and equipment, gross | 35,331 | 31,270
Vehicles |  |
Property and equipment |  |
Property and equipment, gross | ¥ 3,397 | ¥ 3,199

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