Property and equipment consists of the following:

 

		December 31,
		2016			2017
		RMB			RMB
Office buildings			281,541			288,046
Furniture			18,078			29,405
Office equipment			271,862			362,254
Leasehold improvements			64,383			100,577
Total property and equipment			635,864			780,282
Less: accumulated depreciation			(198,527)			(260,591)
Property and equipment, net			437,337			519,691

Depreciation expense for property and equipment was allocated to the following:

		Year Ended December 31,
		2015			2016			2017
		RMB			RMB			RMB
Cost of revenues			48,553			61,967			85,887
Selling and marketing expenses			2,694			3,226			5,313
General and administrative expenses			3,031			6,455			8,064
Research and development expenses			703			1,109			1,460
Total			54,981			72,757			100,724