Interim General Manager at SkyCity Auckland, Matt Ballesty said the climb allows Kiwis to pay respects to firefighters lost in a "tragic world event".
"As well as many Kiwi firefighters who've lost their lives in the line of duty, but also for us to give back and honour our firefighters and the incredible work they do in our community every day."
United States Ambassador to New Zealand, Mark Gilbert will also be participating in the stair climb.
"I will do it with a full kit, with the firefighters."
Gilbert said the American flag will be lowered at the US Embassy and Consulate in Wellington today, however the staff will not gather until Monday when everyone is present, for a minute's silence.
Deputy Chief of mission for the US Embassy, Candy Green will also be attending the annual memorial at the Firefighters Reserve in Christchurch, where a sculpture dedicated to lost firefighters was built out of steel from the World Trade Centre, in 2002.