Here are floorplans of the building
enjoy analyzing.
http:// anonfile.com/If0aZ4d0b7/2008070100224002_page__1-49_.pdf
this is what the vault likely looks like.
http:// davewhitmore.net/images/central_office.htm
there are miles of these in midtown, there's one that goes along what is called 6th and a half avenue. check it out. also check out a group called Empire City Subway.
Lesson on fishing: Where i got the doc you reference.
https:// a836-acris.nyc.gov/DS/DocumentSearch/BBL
Boro Manhattan
Block 1268
Bldg 0034
view the entire block by changing Bldg to 0000
enjoy the hunting, find some good stuff in the area.
the building is all a condo
"The 1.5 million-square-foot office and retail development at 666 Fifth Avenue has been the subject of a number of record-setting deals. Kushner Companies bought the property for $1.8 billion in 2007, at the time the most ever paid for a single office building in the U.S.
After the 2008 global financial crisis struck, in early 2010 Kushner's $1.215 billion loan was sent to special loan servicer LNR, in which Vornado Realty Trust would later take a stake. Kushner split the retail space into two condominiums, selling the smaller, 36,473-square-foot space to Inditex, parent company of fashion brand Zara, for $324 million or $8,300 per square foot on a blended basis, the highest price ever paid for commercial property larger than 10,000 square feet in New York City. Vornado bought a controlling 49.5 percent interest in the office condominium for $80 million in December 2011, and took the remaining 40,742-square-foot retail condo for $707 million in July 2012.
The 39-story 1957 building, designed by Carson & Lundin, stretches from 52nd Street to 53rd Street and includes landmarked lobby artwork: Isamu Noguchi's "Ceiling and Waterfall" installation."
https:// therealdeal.com/new-research/topics/property/666-fifth-avenue/
there's more than just this tunnel < this is not so hidden there are more in the same network.
https:// www.6sqft.com/video-go-inside-the-citys-longest-underground-tunnel-from-rockefeller-center-to-times-square/