The Galactic Starcruiser Terminal was a structure on the surface of a planet where passengers arrived prior to starting a trip the MPO-1400 Purgill-class star cruiser Halcyon. The passengers boarded Launch Pods at the terminal that transported them to the starcruiser.
This terminal will in reality be the entrance and check-in area for guests staying at the upcoming Star Wars: Galactic Starcruiser hotel at Walt Disney World. The rest of the hotel will be blocked by landscaping to maintain the illusion that guests are staying on a vessel in space, and are at the "terminal" to board "Launch Pods" that will take them to the Halcyon. A map on the Walt Disney World website teasing the opening of the hotel suggests what the fictional version of the terminal looks like.
The official address of the real-world terminal is: Star Wars: Galactic Starcruiser Terminal 201 South Studio Drive Bay Lake, Florida 32830