666 5th avenue back in the news today - in pictures only, several pics clearly displaying the address. Pics celebrating Easter Parade from the 1950's - UK Daily Mail:

https://www.dailymail.co.uk/news/article-6947083/Easter-Parade-pageantry-Rare-1950s-photos-holidays-Sunday-Best-outfits.html

Not sure the significance, but caught my eyes.