
	As of December 31,
	2020		2021
Land	$	66	$	65
Building and site improvements	711		737
Leasehold improvements	435		594
Computer equipment	560		468
Leased computer equipment	596		650
Leased vehicles	6		7
Internal-use software	203		258
Furniture and fixtures	83		99
Dockless e-bikes	—		—
Construction in progress	170		157
Total	2,830		3,035
Less: Accumulated depreciation and amortization	(1,016)		(1,182)
Property and equipment, net	$	1,814	$	1,853

We capitalized $76 million and $55 million in internal-use software costs during the years ended December 31, 2020 and 2021, respectively, which is included in property and equipment, net on the consolidated balance sheets. Amortization of capitalized software development costs was $22 million, $55 million, and $69 million for the years ended December 31, 2019, 2020 and 2021, respectively.

Amounts in construction in progress represent buildings, leasehold improvements, assets under construction, and other assets not placed in service.

Depreciation expense relating to property and equipment was $433 million, $364 million, and $393 million for the years ended December 31, 2019, 2020 and 2021, respectively. Included in these amounts were depreciation expense for leased computer equipment in the amount of $146 million, $198 million, and $217 million for the years ended December 31, 2019, 2020 and 2021, respectively. Accumulated depreciation and amortization included $303 million and $390 million of leased computer equipment depreciation as of December 31, 2020 and 2021, respectively.