Where is that church/building??

It's listed in the filming locations: 120 Judge John Aiso Street, Los Angeles.

And yes, it's still there! Just a block North of 1st street, downtown. Check it out on Google Maps street view.

It looks like the worms are still on the paintwork if you look at the roofing.

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Looks like there is a new parking deck next door. It's sort of out of place. Stuck between that and a cafe.

It's somewhere in Los Angeles, It's a theatre now. The scream factory DVD has a tour of the place in the special features with Sean Clark from Hallowed Grounds.