London City Region

Current collaborative arrangements
Policy and infrastructure collaboration across the Wider South East, including WSE Summits, Political Steering Group meetings, and the Strategic Spatial Planning Officer Working Group
https://www.london.gov.uk/about-us/organisations-we-work/policy-and-infrastructure-collaboration-across-wider-south-east

Mayor of London’s engagement with authorities in the Wider South East in the context of preparing the new London Plan
https://www.london.gov.uk/what-we-do/planning/who-we-work/mayors-engagement-wider-south-east

International examples of coordinated planning at metro scale
Institut d’aménagement at d’urbanisme de la région Île-de-France
https://en.iau-idf.fr/

New York City regional planning office
https://www1.nyc.gov/site/planning/plans/region/region.page

New York Regional Plan Association
http://www.rpa.org/

Greater Sydney Commission
https://www.greater.sydney/