Clue to Finding the Black Key

“Your journey is almost complete.
But now you face the most difficult challenge of the Black Key.
Are you ready? Then let’s begin:
Go to the Pullman campus building
named after the university president whose tenure in office was the greatest number of years.
Once there, find the portrait
of this president somewhere in the building.
Found it? Good. Now notice how
many blue stripes are on the left sleeve of his clothing.
Go to the floor of this building
that is the same number as the stripes.
Got there?
Now, find the beings with green
locks which are close to the geographic center of this floor.
There is an quote near the beings.
Visit Black Key Form 5.1 on the common reading OrgSync page to enter that quote.”
 
(Note: enter only the last, bottommost line of the entire quote.)