My #1 suggestion would be to work with a condo specialist!
I often tell sellers that "anyone" can sell your condo...but at what price?
Sure, I would love to compete for your business so don't get me wrong here. If I were selling my condo, I would most likely select an agent that specializes in condos. If you did not select me for your listing, I would gladly give you the name of the 1 or 2 agents that I would select if it were my own. These agents, like myself, specialize with condos and market to condo buyers!
The problem with selecting just "any" agent to sell your condo is that they don't have marketing that is targeted to condo buyers everyday! They might be selling a HOME in the west hills one day and then Lake Oswego the next. They can not flip on a switch and become an expert in marketing condos overnight, it just doesn't work this way. And be prepared...every agent you interview will tell you they will market your condo on the internet!!!
I see that you posted your question the start of November and there has not been a larger new listing come on the market yet this month at Eliot Tower so I am guessing you might still be thinking about selling? At 1,800 square feet, you own a higher end luxury condo that deserves "high"end marketing. I would say to start thinking like a buyer. Start searching Google and Bing like a buyer would...Eliot Tower condominiums, Portland luxury condominiums, What are the HOA fees at Eliot Tower? etc.
The agents that have websites that show up on these searches are probably the agents that you should consider hiring to sell your condo...because they are putting your condo in front of serious buyers! Keep in mind, you don't see Trulia, Zillow or Realtor.com show up on these searches. I bring this up because when most agents say they will "market" your home online, this is usually what they mean...and yes, I also market on all of these websites as well, but it takes much more to do a good job of marketing your condo!