Mr Brown said finalising the City Rail Link and confirming government funding for other Auckland transport projects will "leave a blueprint for others to succeed on" over the next 15 to 20 years.
The second-term inaugural mayor of Auckland Council has been plagued with controversies, including revelations of his affair with Bevan Chuang in 2013 and recent concerns about increases to council rates.
But Mr Brown says being a mayor has been a great honour, and he has loved "every second" he has been in the job.
"I loved coming into the job, I will enjoy every minute of this last year and I [will] make sure it counts."
The mayor says he wants to leave the city in the best possible shape for the next mayor who takes over at the start of November. He says that includes getting trees planted on One Tree Hill and getting restoration under way at St James Theatre.
Labour MP Phil Goff and former Xero boss Victoria Crone are both vying to be his replacement.
Other people in the running include Orakei Local Board member Mark Thomas, right-winger Stephen Berry, activist Penny Bright and former Green Party member David Hay.