Terminal 4, known as the Green Terminal, contains Concourse G with 14 gates, and functions as the Spirit operating base. Concourse H closed in December 2017 and has since been demolished. The former Concourse H was reconfigured and redesigned by the architectural firms of PGAL/Zyscovich joint venture. The new three-story facility, which was renamed Concourse G, has 14 new gates, 11 of which are international/domestic capable and one arrivals area for bussing operations. New concessions, seatings and approximately 50,000 sq. ft. of administrative offices for the Aviation Department are being designed on the upper levels of the facility. An expanded U.S. Customs and Border Protection facility will also be included in the new Eastern Expansion construction.