Depreciation and amortization on property and equipment is calculated using the straight-line method over the estimated useful lives indicated below:
| | | | | | | Asset Category | Period | | Computer equipment | 5 years | | Computer software and capitalized internal-use software | 1.5 to 3 years | | Office furniture and equipment | 5 years | | Buildings | 25 to 40 years | Leasehold improvements | Lesser of estimated useful life or remaining lease term |
Property and equipment, net, consisted of the following (in thousands):
| | | | | | | | | | As of December 31, | | 2020 | 2021 | | Computer equipment | $ | 55,972 | | $ | 56,513 | | | Computer software and capitalized internal-use software | 163,702 | | 175,129 | | | Office furniture and equipment | 47,596 | | 43,169 | | | Leasehold improvements | 243,110 | | 213,950 | | | Buildings and land | 16,844 | | 16,844 | | | 527,224 | | 505,605 | | | Less: Accumulated depreciation and amortization | (267,851) | | (379,194) | | | 259,373 | | 126,411 | | | Construction in progress | 10,821 | | 30,174 | | | Total property and equipment, net | $ | 270,194 | | $ | 156,585 | |
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