6. Property and equipment

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


	March 31,		December 31,
	2019		2018
Leasehold improvements	$	485,162	$	474,808
Construction in progress		61,080		40,369
Software		53,971		51,534
Computer equipment		15,257		14,215
Furniture, fixtures and office equipment		2,144		2,141
Total property and equipment		617,614		583,067
Less: accumulated depreciation and amortization		(287,880)		(268,888)
Total property and equipment, net	$	329,734	$	314,179

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


	Three Months Ended
	March 31,
	2019		2018
Network access	$	11,582	$	13,587
Network operations		4,386		4,256
Development and technology		2,779		2,508
General and administrative		262		255
Total depreciation and amortization of property and equipment	$	19,009	$	20,606