Stark in the sun - sentence dillema

Posted by Ilia on September 24, 2003

Hi! Here is the puzzle: "Amidst the midtown bustle, down the gray avenues of Manhattan, stark in the morning sun, Rupert approaches his office".

Could someone please tell me to what part of the sentence the author refers when he says STARK IN THE MORNING SUN? Was it Rupert or gray avenues? Or alltogether :))