The following summarizes the components of real estate properties under development as at December 31, 2018 and 2019:

At December 31,	2018			2019
Building at cost	$	28,213		$	27,732
Less: accumulated depreciation		(15,413	)		(15,007	)
		12,800			12,725
Construction in progress		76,760			156,221
Land use right		82,050			82,739
Net book value	$	171,610		$	251,685

Real estate properties under development of $81,688 (2018 : Nil) have been pledged to banks to obtain loan facilities (See Note 8).

Included in construction in progress were capitalized debt issuance costs and interest for bank loans amounting to $1,473 and $707, respectively.

The Company leased its buildings to third parties with the carrying amount as shown below:

At December 31,	2018			2019
Buildings at cost	$	28,213		$	27,732
Less: accumulated depreciation		(15,413	)		(15,007	)
Buildings, net	$	12,800		$	12,725

At December 31, 2019, scheduled minimum rental payments to be received for buildings leased to others were $1,836 and the lease term expires on December 31, 2020.