Intangibles	9 Months Ended
Sep. 30, 2013
Intangibles
Intangibles	(8) Intangibles At September 30, 2013 and December 31, 2012, intangible lease assets, comprised of lease-up intangibles, above market tenant lease intangibles and below market ground lease intangibles, were $784 million and $794 million, respectively. At September 30, 2013 and December 31, 2012, the accumulated amortization of intangible assets was $276 million and $241 million, respectively. At September 30, 2013 and December 31, 2012, intangible lease liabilities, comprised of below market lease intangibles and above market ground lease intangible liabilities were $208 million and $194 million, respectively. At September 30, 2013 and December 31, 2012, the accumulated amortization of intangible liabilities was $105 million and $90 million, respectively.

(8) Intangibles

At September 30, 2013 and December 31, 2012, intangible lease assets, comprised of lease-up intangibles, above market tenant lease intangibles and below market ground lease intangibles, were $784 million and $794 million, respectively. At September 30, 2013 and December 31, 2012, the accumulated amortization of intangible assets was $276 million and $241 million, respectively.

At September 30, 2013 and December 31, 2012, intangible lease liabilities, comprised of below market lease intangibles and above market ground lease intangible liabilities were $208 million and $194 million, respectively. At September 30, 2013 and December 31, 2012, the accumulated amortization of intangible liabilities was $105 million and $90 million, respectively.