4. Intangibles

The gross carrying amount and accumulated amortization of the Company’s intangible assets and liabilities consisted of the following ($ in thousands):

	September 30, 2018			December 31, 2017
Intangible assets:
In-place lease intangibles	$	303,410		$	131,833
Below-market ground lease intangibles		4,623			4,623
Above-market lease intangibles		18,541			6,670
Prepaid ground lease rent		16,114			16,114
Other		5,676			676
Total intangible assets		348,364			159,916
Accumulated amortization:
In-place lease amortization		(74,130	)		(45,160	)
Below-market ground lease amortization		(142	)		(85	)
Above-market lease amortization		(3,627	)		(600	)
Prepaid ground lease rent amortization		(321	)		(151	)
Other		(203	)		(76	)
Total accumulated amortization		(78,423	)		(46,072	)
Intangible assets, net	$	269,941		$	113,844
Intangible liabilities:
Below-market lease intangibles	$	47,911		$	14,920
Above-market ground lease intangibles		4,657			—
Total intangible liabilities		52,568			14,920
Accumulated amortization:
Below-market lease amortization		(8,219	)		(1,764	)
Above-market ground lease amortization		(2	)		—
Total accumulated amortization		(8,221	)		(1,764	)
Intangible liabilities, net	$	44,347		$	13,156

The estimated future amortization on the Company’s intangibles for each of the next five years and thereafter as of September 30, 2018 is as follows ($ in thousands):

	In-place Lease Intangibles		Below-market Ground Lease Intangibles		Above-market Lease Intangibles		Pre-paid Ground Lease Intangibles		Below-market Lease Intangibles			Above-market Ground Lease Intangibles
2018 (remaining)	$	56,077	$	20	$	1,143	$	57	$	(2,562	)	$	(14	)
2019		68,165		79		4,160		227		(9,235	)		(54	)
2020		33,156		79		3,223		227		(7,353	)		(54	)
2021		25,390		79		2,631		227		(5,602	)		(54	)
2022		18,615		79		2,024		227		(4,396	)		(54	)
Thereafter		27,877		4,145		1,733		14,828		(10,544	)		(4,425	)
	$	229,280	$	4,481	$	14,914	$	15,793	$	(39,692	)	$	(4,655	)