The Sultan Iskandar Building (BSI; ) is a customs, immigration and quarantine (CIQ) complex in Johor Bahru, Johor, Malaysia. Located at the northern end of the Johor–Singapore Causeway, it is one of two land ports of entry to Malaysia on the Malaysia–Singapore border. The building was named after the late Sultan Iskandar of Johor. Built as part of the Southern Integrated Gateway project on the former site of the Lumba Kuda flats, Kampung Bukit Chagar, the building occupies an area of , making it the largest CIQ complex in Malaysia. The building started operations in 2008, replacing the former Johor Bahru Checkpoint. From Malaysia, the main expressway leading to the building is the Johor Bahru Eastern Dispersal Link Expressway. After border inspection, vehicles (and pedestrians) continue onto the Causeway, eventually reaching the Woodlands Checkpoint in Singapore. Pedestrian access to the building is provided via the Johor Bahru Sentral railway station, which is linked to the building by a footbridge. History Background Originally even after Johor and Singapore is made different entity by the British and Johor–Singapore Causeway was built to accommodate land access between both states, no such border control was established due to both still falls under British's Straits territory purview. However checks would be done periodically due to extraordinary circumstances in both side, such as Malayan Emergency by local polices, but otherwise the citizens of both sides are free to roam between the regions without many conditions. This also extends to the point when Malaya, including Johor achieved independence in 1957 while Singapore is still part of the Crown Colony and also when Singapore and Malaya formed Federation of Malaysia later on. However the necessities for a proper border control arose when Singapore was separated from Malaysia, making them a sovereign country of their own in 1965. Establishment of border control When the border control was first established between both Malaysia and Singapore, the only necessary document was mainly only identity cards issued by both governments to pass through and both countries still retained joined visa issuance to visitors. However, as authorities on both sides are still concerned of each other affairs, the join visa was later discontinued, and tighter control was later introduced using either international passport or special limited passport for Johor-Singapore crossing as of 1967. This also triggers the need of establishment of a proper border checkpoint building on both sides, where Malaysia established their