The Quantum Cafe
The Quantum Café was a 24th century officers' club associated with Starfleet Headquarters on Earth.
It was frequented by Starfleet officers and was therefore included in the replica of Starfleet Headquarters created by Species 8472 on Terrasphere 8. (VOY: "In the Flesh")
According to the call sheets, Quantum Café was built on Paramount Stage 16.