Sultan Iskandar Building, Customs and immigration building in Johor Bahru, Malaysia.

The Sultan Iskandar Building is Malaysia's largest customs, immigration and quarantine complex, covering 232,237 square metres at the northern end of the Johor–Singapore Causeway. It holds 77 vehicle counters (39 arrival, 38 departure) and 100 motorcycle counters, plus 36 car and 25 motorcycle customs lanes. A footbridge links it to Johor Bahru Sentral railway station.

The facility opened in December 2008 on land previously occupied by Lumba Kuda residential flats and replaced an older checkpoint structure. This modernization reflected growing cross-border traffic between Malaysia and Singapore.

The complex is named after Sultan Iskandar Al-Haj, ruler of Johor when the building opened; the Malay name is Bangunan Sultan Iskandar. Its pedestrian link to Johor Bahru Sentral station is a footbridge, and travellers crossing on foot pass through covered clearance halls. The 2023 blackout showed how a single CIQ point governs daily movement between the two countries.

Allow extra time during peak hours, as vehicle processing can vary significantly depending on the time of day. The facility is well-organized for different vehicle types, so follow the signs to reach the correct lane for your vehicle.

The 2023 blackout is the most telling detail: on 6 December 2023 a scheduled maintenance night went wrong when the backup generators failed, leaving the complex without power for 11 hours until the following morning. The building covers 232,237 square metres, making it Malaysia's largest CIQ complex.