I need level ideas for a zombie apocalypse map

[Gaming-Phoenix]

Wait a minute, Isn’t this a dupe?

I need ideas for my new map

I have just started a new map called Zompacalypse. Basically, there is an agency that has been taken over and you are with an agent named Vortex, and you need to escape. I already made the first room, and I don’t know what to add. Any ideas?