Beginning:
Dear Mr Azcón,
Dear Mayor Azcón,
To the Mayor of Zaragoza
Closing:
Thank you for your time. /I hope you will take this into consideration.
Yours sincerely/Sincerely,
Natalia López
USEFUL LANGUAGE
https://sites.google.com/view/c1-2-crime-and-the-law/session-3/measures-in-place
https://natalialzam.wordpress.com/2018/01/07/linking-words-for-writing-tasks/