Hi Mick, City of Sydney allows aggregation of Car Spaces and Storge lots for Residential and Business Units based on certain conditions. Please click on the following link for City of Sydney website which provides more details related to aggregation of car spaces and storages.
http://www.cityofsydney.nsw.gov.au/live/residents/rates/rate-categories-and-status-checks
Hope it helps.
Amit
