Proposition U was a ballot initiative for the city of Los Angeles. Proposed by Zev Yaroslavsky, Joel Wachs,[1] and Marvin Braude, and placed on the ballot in November 1986, Prop. U aimed to slow development in the city. Voters approved Prop. U by a 2-1 margin. The passage of the ballot initiative halved the allowable residential density throughout much of Los Angeles.[2]