Note 8. Other Assets and Deferred Charges, Net

Other assets and deferred charges, net at December 31, 2016 and 2015 are composed of the following:

	December 31,
	2016		2015
Lease origination costs (a)	$	17,717,000	$	18,394,000
Unsecured revolving credit facility financing costs		1,554,000		2,288,000
Prepaid expenses		4,872,000		6,104,000
Leasehold improvements, furniture and fixtures		431,000		532,000
Investments related to share-based compensation		447,000		539,000
Interest rate swaps		3,074,000		—
Other		1,411,000		1,339,000
Total other assets and deferred charges, net	$	29,506,000	$	29,196,000

Lease origination costs include the unamortized balance of intangible lease assets resulting from purchase accounting allocations of $8.4 million (cost of $20.0 million and accumulated amortization of $11.7 million) and $8.0 million (cost of $21.3 million and accumulated amortization of $13.3 million) for the years ended December 31, 2016 and 2015, respectively.

Deferred charges are amortized over the terms of the related agreements. Amortization expense related to deferred charges (including amortization of deferred financing costs included in non-operating income and expense) amounted to $5.4 million, $5.2 million and $5.6 million for 2016, 2015 and 2014, respectively. The unamortized balances of deferred lease origination costs and deferred financing costs relating to the unsecured revolving credit facility are net of accumulated amortization of $24.7 million and $4.4 million, respectively, and will be charged to future operations as follows:

	Lease		Unsecured revolving
	origination		credit facility
	costs		financing costs
2017	$	2,788,000	$	746,000
2018		2,353,000		746,000
2019		2,012,000		62,000
2020		1,567,000		—
2021		1,176,000		—
Thereafter		7,821,000		—
	$	17,717,000	$	1,554,000