Christ the Light, dedicated in 2008, is situated along the western shore of Lake Merritt. It is the new seat of the local archdiocese. Previous church homes to the diocese were damaged in the 1989 earthquake and were eventually demolished.
In the tradition of old European cathedrals, however, parishioners can be buried in the mausoleum below the main floor. There is room for 1300 niches for cremated remains and 1800 crypts for burials. I'm unaware of any other church in California, except the old missions, doing this. I'm sure someone will correct me if I'm wrong. So far only a small number of these spaces are in use. While the crypt walls look like marble, they are actually thin metal which have been treated to look like marble. There are wall sections that look like onyx but may be glass, and are beautifully backlit.
Taphophile Tragics where you'll find more musings on cities of the dead.