6.	Intangible Assets and Liabilities

The following table summarizes our intangible assets (acquired above-market leases and acquired in-place leases) and intangible liabilities (acquired below-market leases) and the related amortization as of the dates thereof and for the periods set forth below.

	As of
(Amounts in thousands)	March 31, 2018			December 31, 2017
Intangible assets:
Gross amount	$	550,516		$	553,063
Accumulated amortization		(216,533	)		(200,857	)
	$	333,983		$	352,206
Intangible liabilities:
Gross amount	$	202,625		$	205,101
Accumulated amortization		(79,952	)		(75,073	)
	$	122,673		$	130,028

	For the Three Months Ended March 31,
(Amounts in thousands)	2018		2017
Amortization of above and below-market leases, net (component of “rental income”)	$	4,420	$	3,008
Amortization of acquired in-place leases (component of “depreciation and amortization”)"		15,293		17,774

The table below sets forth annual amortization of acquired above and below-market leases, net (an increase to “rental income”) and amortization of acquired in-place leases (an increase to “depreciation and amortization”) for each of the five succeeding years commencing from January 1, 2019.

For the Year Ending December 31,	Above and Below-Market Leases		In-Place Leases
(Amounts in thousands)
2019	$	14,257	$	53,428
2020		8,679		42,303
2021		4,341		30,310
2022		942		24,200
2023		4,421		19,445