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PROPERTY AND EQUIPMENT, NET (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
PROPERTY AND EQUIPMENT, NET |
Schedule of property and equipment | ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2019 | ​ | 2020
At cost: |  |  |  |
Land | ​ | 855,310 | ​ | 808,651
Buildings |  | 5,964,048 |  | 9,552,953
Data center equipment |  | 5,567,606 |  | 10,694,057
Leasehold improvement |  | 6,111,733 |  | 7,307,207
Furniture and office equipment |  | 61,974 |  | 97,039
Vehicles |  | 4,115 |  | 4,383
​ |  | 18,564,786 |  | 28,464,290
Less: Accumulated depreciation |  | (2,580,320) |  | (4,127,504)
​ |  | 15,984,466 |  | 24,336,786
Construction in progress |  | 3,200,173 |  | 5,259,275
Property and equipment, net |  | 19,184,639 |  | 29,596,061
Schedule of depreciation of property and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Cost of revenue |  | 674,560 |  | 1,045,446 | ​ | 1,418,846
General and administrative expenses |  | 7,319 |  | 10,448 | ​ | 120,604
Research and development expenses | ​ | 572 | ​ | 1,277 | ​ | 3,680
​ |  | 682,451 |  | 1,057,171 | ​ | 1,543,130

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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