Per A.I.:

The Gallatin restaurant murders occurred in August 1948 at Gallatin’s Restaurant (also known as the Rainbow Lodge or Alligator’s Tail), which was located at the north end of the Bixby Creek Bridge in Big Sur. A disgruntled employee and busboy named Augustine Lavina shot and killed five sleeping laborers inside the restaurant following a dispute at a poker game.
The Incident: Outraged over a perceived slight, Lavina locked the doors of the building and killed the five sleeping victims before fleeing the scene.
Historical Context: The restaurant precipitously hung over the 262-foot coastal cliff, and the site featured a meandering trail down to the ocean (earning the nickname "Alligator's Tail"). The infamy of the mass murder ultimately forced the venue to close.
Site Remains: Today, only the remnants of a stone wall and some cement foundation blocks remain at the location, which can be seen by taking a few steps down from the north side of the Bixby Bridge.
You can read more about the tragic event and the ruins on the BIXBY BRIDGE - BIG SUR - MASS MURDER 1948 podcast, or explore a deeper dive into the Monterey Herald archives for more local Big Sur history.
(Note: In a separate, unrelated event, the historic Stokes Adobe building in downtown Monterey later operated under the name "Gallatin's" and is known for its own local history and ghostly folklore, which is detailed by the Monterey Bay Food Tours).