Can You Guess What These Portland Buildings Are By Seeing Only One Letter?

How well do you know the buildings around Portland? Think you can identify them by just seeing one letter on the building? 

I walked around Portland today and took some close up photos of buildings. Some are well known. Other's not so much, but you'll recognize them when you see them.

Here are six buildings in Portland shown in extreme close up of just one letter. The letters all appear on the building. Can you guess each of the six buildings?

Take the test. It starts easy and gets harder as you go. Let us know how you did in the comments below or on Facebook and Twitter. Can you get 6 out of 6?