UPDATED, 11:45 AM, 6/3/18

In a late-night tweet Saturday, the Culinary announced it had reached a tentative agreement with MGM Resorts International. So two major companies have agreed to terms amid the threat of a strike.

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The Culinary Union and Caesars Entertainment have reached a tentative agreement on a five-year contract for guest room attendants, bartenders, bellmen, cooks and other hotel workers at nine properties after the existing contracts expired at midnight on Friday.

The union and Caesars, in a joint statement released Saturday afternoon, declined to elaborate on the specific details of the contract, though they said that it includes “groundbreaking language” on worker security as it relates to sexual harassment, workload, technology and immigration. A ratification vote by union members is expected to be scheduled “very soon” and more details will be released after the vote, the statement said.

In a statement, the union’s secretary treasurer, Geoconda Arguello-Kline, called the agreement “the best contract with the highest wage increases that workers have ever had.”

“This innovative contract sets clear goals regarding technology and automation for worker retention, job training, advance notice of implementation, and severance package,” Arguello-Kline said.

Caesars Global President and lead negotiator Tom Jenkin said in a statement that it is a “historic agreement.”

“We are pleased that all economic and personal security issues have been resolved with this new contract and that employees will continue to provide guests superior service and experiences,” Jenkin said.

The new five-year contract covers workers at Bally’s, the Flamingo, Harrah’s, Paris, Planet Hollywood, the Cromwell, the LINQ, Caesars Palace and the Rio.

However, the Culinary Union has yet to reach an agreement with 10 properties owned by MGM Resorts, as well as 16 other properties on the Strip and in downtown Las Vegas. Contracts for workers at those properties also expired at midnight on Friday.

Union workers opened a “Strike HQ” on Friday morning, painting a building and making strike picket signs. Culinary Union workers voted 99 percent in May to authorize a strike at any point after the contracts expired, though the union’s negotiating committee has yet to call one.

The last citywide strike was in 1984 and lasted 67 days, paralyzing the casino industry in Las Vegas. Workers last voted to authorize a citywide strike in 2002 but ultimately reached an agreement with casino companies before a strike was called.