Rockefeller Center
From ErrantryWiki
The interconnected complex of nineteen commercial buildings located between 5th and 6th Avenues and 48th to 51st Streets in midtown Manhattan. (See the Wikipedia entry for more general information.)
In SYWTBAW, Tom Swale mentions that Carl runs this worldgate. (He most likely means that Carl acts in a supervisory capacity for its handling by the Penn worldgating team.) The worldgate is normally located just off the tunnel complex below the Center. (SYWTBAW et al.)