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PROPERTY AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2020
PROPERTY AND EQUIPMENT, NET |
PROPERTY AND EQUIPMENT, NET | 5 PROPERTY AND EQUIPMENT, NET Property and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | 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
| (1) | The carrying amounts of the Company’s property and equipment acquired under finance leases and other financing arrangement were RMB 6,070,349 and RMB 8,207,825 as of December 31, 2019 and 2020, respectively.
| (2) | Depreciation of property and equipment (including assets acquired under finance leases and other financing arrangement) was RMB 682,451, RMB 1,057,171 and RMB 1,543,130 for the years ended December 31, 2018, 2019 and 2020, respectively, and included in the following captions:
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
| (3) | Property and equipment with net a book value of RMB 2,493,872 and RMB 3,497,447 was pledged as security for bank loans (Note 9) and other financing obligations (Note 12) as of December 31, 2019 and 2020, respectively.
| (4) | As of December 31, 2019 and 2020, payables for purchase of property and equipment that are contractually due beyond one year of RMB 231,458 and RMB 139,162, respectively, are recorded in other long-term liabilities in the consolidated balance sheets.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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