What Year did WACA radio 660 (monitor) broadcast from Radio Central in NY & what bldg?

I am trying to figure the value of a Book mark I found inside a super old book that is in mint condition- it shows a bldg, and states" From Radio Central in New York...MONITOR Parading the exciting sounds of a world at work and play...in music...news and sports reports...comedy...drama...and on-the-spot pick-ups from everywhere
WACA radio 660 NBC"- on the back "MONITOR the new NBC radio service Takes you everywhere: 40 solid hours of exciting radio every weekend starting Saturdays at 8 am WACA radio 660 NBC"
Asked Jan 14, 2010

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