4. Property and equipment

The following is a summary of property and equipment, at cost less accumulated depreciation and amortization:

	September 30, 2016			December 31, 2015
Leasehold improvements	$	345,249		$	243,743
Construction in progress	19,460			57,692
Software	31,376			24,349
Computer equipment	10,757			10,366
Furniture, fixtures and office equipment	1,750			1,738

Total property and equipment	408,592			337,888
Less: accumulated depreciation and amortization	(158,281		)	(123,388		)

Total property and equipment, net	$	250,311		$	214,500

Depreciation and amortization expense, which includes depreciation and amortization for property and equipment under capital leases, is allocated as follows in the accompanying condensed consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015

Network access	$	7,227	$	6,277	$	18,689	$	17,264
Network operations	3,733		2,087		10,183		5,916
Development and technology	1,881		1,377		5,172		3,887
General and administrative	252		292		757		832

Total depreciation and amortization of property and equipment	$	13,093	$	10,033	$	34,801	$	27,899