4.	*Intangible Assets*

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


	September 30, 2016		December 31, 2015

Database	$	26,849,000	$	22,790,000
Accumulated amortization		(19,152,000)		(17,121,000)

Database, net		7,697,000		5,669,000

Customer relationships		14,100,000		14,100,000
Accumulated amortization		(9,030,000)		(8,328,000)

Customer relationships, net		5,070,000		5,772,000

Website		16,893,000		14,735,000
Accumulated amortization		(12,066,000)		(10,669,000)

Website, net		4,827,000		4,066,000

Acquired below market lease		2,800,000		2,800,000
Accumulated amortization		(2,800,000)		(2,620,000)

Acquired below market lease, net		—		180,000

Intangibles, net	$	17,594,000	$	15,687,000

With respect to the database intangible asset, the Company capitalized approximately $1,338,000 and $887,000 during the three months ended September 30, 2016 and 2015, respectively, and approximately $4,059,000 and $2,201,000 during the nine months ended September 30, 2016 and 2015, respectively. Separately, for the website intangible asset, the Company capitalized approximately $768,000 and $1,243,000 during the three months ended September 30, 2016 and 2015, respectively, and approximately $2,158,000 and $2,254,000 during the nine months ended September 30, 2016 and 2015, respectively.

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, which is charged to cost of sales, approximately $233,000 and $702,000 related to customer relationships, which is charged to sales and marketing expense, approximately $475,000 and $1,397,000 related to website development, which is charged to product development expense, and approximately $29,000 and $180,000 related to the value ascribed to the below market terms of the office lease, which is charged to general and administrative expense, all in the Reis Services segment. Amortization expense for intangible assets aggregated approximately $1,289,000 and $3,790,000 for the three and nine months ended September 30, 2015, of which approximately $541,000 and $1,530,000 related to the database, approximately $237,000 and $713,000 related to customer relationships, approximately $436,000 and $1,320,000 related to website development, and approximately $75,000 and $227,000 related to the value ascribed to the below market terms of the office lease.