An Altar de Muerto is usually a memorial shrine for someone who passed away recently.
This one seems to be in memory of Affordable Housing in San Francisco.
People were writing messages in memory of passed loved ones on cards hanging around the altar.
Photo taken at the Dia de los Muertos procession in the Mission (San Francisco) on Nov 2, 2014.
For more photos and more info on this event, please check out my Dia de los Muertos series.