Tai Kok Tsui is an area west of Mong Kok in Kowloon, Hong Kong. The mixed land use of industrial and residential is present in the old area. The Cosmopolitan Dock and oil depots were previously located there. Blocks of high-rise residential buildings have been erected on the reclaimed area to the west, which marked the revitalisation of the area with many restaurants and bars setting up shop. Many of the older residential buildings have been vacated and are set to be replaced by high-rise residential and commercial buildings. Demography Until recently, many of the residents in Tai Kok Tsui were senior citizens but there has been a more recent influx of younger people, especially those returning to Hong Kong after time spent overseas. Traditionally the area has been known as one characterised by the presence of immigrants - often described as 'illegal immigrants' though this term is used rather intolerantly in Hong Kong and at times may describe people who are no such thing. History Before any reclamation, Tai Kok Tsui was geographically a long island of Hong Kong of granite linked by an isthmus at its north to Kowloon Peninsula. The long granite hill divided the reclamation in its east and dock area in the west in 1924. The tip of the cape hosted the Asia oil tanks. The area was mainly for dock facilities at this period as reflected in present-day Anchor Street. The Cosmopolitan Dock survived till the 1960s which is now Cosmopolitan Estate (). The Guangzhou–Shenzhen–Hong Kong Express Rail Link was built underneath Tai Kok Tsui. In January 2010, the local residents protested and said the railway would cause unbearable noise pollution to residents in some districts and could cause a number of old buildings with poor foundations to collapse. The Office for Safeguarding National Security of the CPG in the HKSAR plans to build its permanent office at Tai Kok Tsui. Coast and reclamation The Chinese character Tsui () in Tai Kok Tsui implies that the area was originally an elongated cape on the west side of Kowloon Peninsula. The cove between the cape and Kowloon Peninsula was reclaimed during the period of 1867–1904. More reclamation along its shore took place during the period of 1904–1924 and more covered its tip during the period of 1924–1945. Minor reclamation was needed during the period 1964–1982 when the Tai Kok Tsui Ferry Pier () was built.