Looks like Park Ave is just where their U3 Music company office is located. I doubt they're there often nowadays. I believe Hikki would be going all over the place in the next 2 months.

And who needs to find people who live there when you have good ol' Google Street View....

http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=800+5th+Ave+New+York,+NY+10065&sll=37.0625,-95.677068&sspn=41.411029,92.636719&ie=UTF8&ll=40.765601,-73.97202&spn=0.000606,0.001414&t=h&z=20&iwloc=addr&layer=c&cbll=40.765674,-73.971964&panoid=K-xGAsdRbTpSskJHPoqVcg&cbp=12,88.50563726500687,,0,3.20683111954463

Scary eh? It is a residential building since there were realty listings for that building but you would never be able to send mail there since that's just the address for the building and no unit is listed. And no stalking!