The Warriors announced the long-expected move Tuesday. The tender allows the team to match any offer Rush receives this offseason.
The 26-year-old Rush appeared in 65 games last season after coming over in a trade from Indiana for Lou Amundson. He averaged a career-high 9.8 points, 3.9 rebounds and 1.4 assists in 26 minutes per game.
Rush ranked sixth in the NBA in 3-point percentage, shooting a career-high 45.2 percent from behind the arc. He also posted career highs by shooting 50 percent from the field and 79 percent on free throws.