The NBC website states:
"One-hour drama
In the aftermath of a global event that devastates the world's infrastructures, a small band of survivors strives to rebuild society and unravel the mysteries of why the event took place and what the future has in store. Told from the point of view of an eclectic group of neighbors in a Van Nuys, California apartment building, this journey of survival will show us that hope is found in the smallest of victories and heroes are born every day."
This blurb puts me in mind of Survivors (BBC 1975/200
, if you haven't seen them I do heartily recommend them especially the first 38 episodes - the 6 remakes didn't do it for me.
As for Day One I'll give it a go.

