​

​

As of December 31, 

​

2022

2023

​

​

US$

​

US$

Buildings

736,515

​

726,263

Office equipment

18,976

​

17,530

Motor vehicles

1,488

​

1,313

Leasehold improvement

17,701

​

16,890

Land

50,731

​

50,731

Subtotal

825,411

​

812,727

Less: accumulated depreciation

(213,329)

​

(229,831)

Construction in progress

23,371

​

24,090

​

​

635,453

​

606,986

Less: accumulated impairment

​

—

​

(137,626)

​

635,453

​

469,360