Why does everyone think the old Sun Valley Galleria is completely sealed up?
I found a busted service door behind the old food court last week, and it's been open for at least six months based on the graffiti inside, so please stop telling new explorers it's impossible to get into.
Call the non-emergency line and get a report number. Document everything with photos and video before you touch anything. They might have left needles or other hazards you don't want to find by surprise.