I know I've seen this thing. Perhaps even referenced/linked here. But a search didn't unearth.

I'm looking for a map of indoor/underground pathways through midtown to minimize street sidewalk walking. I'm on crutches, so the icy sidewalks are a challenge. My "commute" is roughly 5th Ave at 38th St to 6th Ave at 50th St. Obviously the Rockefeller Center complex helps.