666 Fifth Avenue

http://guestofaguest.com/real-estate/666-fifth-avenue-and-other-satanic-new-york-real-estate

Linda_Blair is known for playing a possessed girl in The/Exorcist movies.

"A key scene of a sleepwalking Regan about to wander off a rooftop was filmed in New York atop 666 Fifth Avenue (where Warner Bros. offices were then located). With no stunt person and no special effects, the shot showed Linda Blair's feet on the edge of the building with Fifth Avenue down below"

http://en.wikipedia.org/wiki/Exorcist_II:_The_Heretic#Screenplay_and_filming,

http://www.littlereview.com/goddesslouise/articles/makexorc.htm,

http://syncnotes.blogspot.com/2010/06/666-fifth-avenue.html,
http://thedigitallabyrinth.blogspot.ca/2012/07/top-of-mark-999-california-street.html

Some people had wondered if Tony_Blair (no direct relation to Linda Blair) was being drawn to the big chair of EU or some uber corporate power structure? So far it remains as a mild concern, after all, what's in a name or #? Human nature isn't necessarily always motivated by greed & power. However, whenever a substantial deal & reward is offered, its very difficult for many to refuse. 
http://c-shapes.blogspot.ca/2012/05/negative-entities-monstrous-forces.html  

http://patternsofsynchronicty.blogspot.ca/2012/10/666-and-other-numbers-and-symbolic.html