Starbase 84

From Memory Alpha, the free Star Trek reference.

Starbase 84 was a Federation starbase capable of handling major starship refits. The base was situated near the Romulan Neutral Zone.

The USS Enterprise-D visited this starbase in 2364. (TNG: "Heart of Glory")

In 2370, a new warp core was installed on the Enterprise-D here. (TNG: "Phantasms")

The exterior footage of Starbase 84 was a reuse of footage of Starbase 74 from TNG: "11001001", which in turn was a reuse of footage of Earth Spacedock from Star Trek III: The Search for Spock.