4.	*Intangible Assets*

The amount of identified intangible assets, including the respective amounts of accumulated amortization, are as follows:


	September 30, 2017		December 31, 2016
Database	$	32,286,000	$	28,146,000
Accumulated amortization		(22,714,000)		(19,974,000)

Database, net		9,572,000		8,172,000

Customer relationships		14,100,000		14,100,000
Accumulated amortization		(9,953,000)		(9,263,000)

Customer relationships, net		4,147,000		4,837,000

Website		20,051,000		17,538,000
Accumulated amortization		(14,328,000)		(12,624,000)

Website, net		5,723,000		4,914,000

Intangibles, net	$	19,442,000	$	17,923,000

The Company capitalized approximately $1,363,000 and $1,338,000 during the three months ended September 30, 2017 and 2016, respectively, and approximately $4,140,000 and $4,059,000 during the nine months ended September 30, 2017 and 2016, respectively, to the database intangible asset. The Company capitalized approximately $762,000 and $768,000 during the three months ended September 30, 2017 and 2016, respectively, and $2,513,000 and $2,158,000 during the nine months ended September 30, 2017 and 2016, respectively, to the website intangible asset.

Amortization expense for intangible assets aggregated approximately $1,765,000 and $5,134,000 for the three and nine months ended September 30, 2017, of which approximately $951,000 and $2,740,000 related to the database, which is charged to cost of sales, approximately $228,000 and $690,000 related to customer relationships, which is charged to sales and marketing expense and approximately $586,000 and $1,704,000 related to website development, which is charged to product development expense, all in the Reis Services segment. Amortization expense for intangible assets aggregated approximately $1,498,000 and $4,310,000 for the three and nine months ended September 30, 2016, of which approximately $761,000 and $2,031,000 related to the database, approximately $233,000 and $702,000 related to customer relationships, approximately $475,000 and $1,397,000 related to website development, and approximately $29,000 and $180,000 related to the value ascribed to the below market terms of a then existing office lease.