6. OTHER INTANGIBLE ASSETS

A schedule of our intangible assets and liabilities and related accumulated amortization and accretion as of December 31, 2015 and 2014, is as follows:


	Assets										Liabilities
	Acquired		Acquired				Franchise		Acquired		Acquired
	Above-Market		In-Place		Tax		Affiliation		Below-Market		Below-Market
December 31, 2015	Leases		Leases		Abatement		Fee		Ground Lease		Leases
	(in thousands)
Gross balance	$	966	$	21,398	$	4,273	$	3,936	$	11,685	$	(19,722)
Accumulated amortization		(843)		(16,943)		(2,322)		(3,375)		(1,422)		13,636
	$	123	$	4,455	$	1,951	$	561	$	10,263	$	(6,086)
Average useful life (in years)		7		8		8		10		84		8


	Assets										Liabilities
	Acquired		Acquired				Franchise		Acquired		Acquired
	Above-Market		In-Place		Tax		Affiliation		Below-Market		Below-Market
December 31, 2014	Leases		Leases		Abatement		Fee		Ground Lease		Leases
	(in thousands)
Gross balance	$	2,402	$	22,680	$	4,273	$	3,936	$	11,685	$	(20,333)
Accumulated amortization		(2,039)		(16,470)		(1,771)		(2,981)		(1,282)		11,676
	$	363	$	6,210	$	2,502	$	955	$	10,403	$	(8,657)
Average useful life (in years)		7		8		8		10		84		8

The amortization of the above‑market leases which decreased rental and other property income was $240,000, $602,000 and $888,000 for the years ended December 31, 2015, 2014 and 2013, respectively. The amortization of the below‑market leases included in rental and other property income was $2,571,000, $2,631,000 and $3,058,000 for the years ended December 31, 2015, 2014 and 2013, respectively. The amortization of in‑place leases included in depreciation and amortization expense was $1,857,000, $2,368,000 and $3,368,000 for the years ended December 31, 2015, 2014 and 2013, respectively. Included in depreciation and amortization expense is franchise affiliation fee amortization of $394,000 for each of the years ended December 31, 2015, 2014 and 2013. The amortization of advance bookings included in depreciation and amortization expense was $0, $190,000 and $61,000 for the years ended December 31, 2015, 2014 and 2013, respectively. Tax abatement amortization of $551,000 for each of the years ended December 31, 2015, 2014 and 2013, and the amortization of below‑market ground lease obligation of $140,000 for each of the years ended December 31, 2015, 2014 and 2013, are included in rental and other property operating expenses.

A schedule of future amortization and accretion of acquisition related intangible assets and liabilities as of December 31, 2015, is as follows:


	Assets										Liabilities
	Acquired		Acquired				Franchise		Acquired		Acquired
	Above-Market		In-Place		Tax		Affiliation		Below-Market		Below-Market
Years Ending December 31,	Leases		Leases		Abatement		Fee		Ground Lease		Leases
	(in thousands)
2016	$	88	$	1,380	$	551	$	561	$	140	$	(2,502)
2017		26		949		551		—		140		(2,399)
2018		9		689		551		—		140		(963)
2019		—		488		298		—		140		(222)
2020		—		178		—		—		140		—
Thereafter		—		771		—		—		9,563		—
	$	123	$	4,455	$	1,951	$	561	$	10,263	$	(6,086)