As buildings typically don’t just crumble in the US, regardless of the death toll, this will be one of the worst period.
An apartment building that collapsed in an instant, at night, with no warning is about as as apocalyptic as it gets. I expect we will hear of 60-70+ deaths as they work through the rubble. With the speed of the collapse, many of these victims were likely buried under tons and tons of rubble before they could have any idea what was happening.