San Francisco’s juvenile hall would close within three years under a proposal heading to the Board of Supervisors on Tuesday with a majority of elected officials on board, backed by prominent supporters.

Six of the 11 supervisors, the district attorney, public defender and other local officials have thrown their support behind the measure requiring the youth detention facility to close by the end of 2021. It would also create a working group to oversee the process and come up with rehabilitative and noninstitutional settings for youths who still require a secure placement.

The supervisors drafted the measure in response to a recent Chronicle report that documented a dramatic drop in serious youth crime that has left the state’s juvenile halls nearly empty and per-inmate costs skyrocketing.

For more on the story by Jill Tucker and Joaquin Palomino go to https://www.sfchronicle.com/ba...ut-down-13751490.php