Intangibles	6 Months Ended
Jun. 30, 2013
Intangibles
Intangibles	(8) Intangibles At both June 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 $794 million. At June 30, 2013 and December 31, 2012, the accumulated amortization of intangible assets was $275 million and $241 million, respectively. At June 30, 2013 and December 31, 2012, intangible lease liabilities, comprised of below market lease intangibles and above market ground lease intangible liabilities were $215 and $199 million, respectively. At June 30, 2013 and December 31, 2012, the accumulated amortization of intangible liabilities was $106 million and $93 million, respectively.

(8) Intangibles

At both June 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 $794 million. At June 30, 2013 and December 31, 2012, the accumulated amortization of intangible assets was $275 million and $241 million, respectively.

At June 30, 2013 and December 31, 2012, intangible lease liabilities, comprised of below market lease intangibles and above market ground lease intangible liabilities were $215 and $199 million, respectively. At June 30, 2013 and December 31, 2012, the accumulated amortization of intangible liabilities was $106 million and $93 million, respectively.