We have a car bay in the lower car park that is owned by the ASIC / Federal Government. It is the bay marked in the photo below.
There is a storeroom that can only be entered via the carbay. You would need to take this into account.

ASIC have a non-trivial process for anyone who wants to buy the car bay from them. Details are contained via the link below
Details you need to know
- It is Lot 87
- It was owned by Charles Latrobe Pty Ltd
- The process is outlined here https://tinyurl.com/BotanicaLot87
I have absolutely no idea if ASIC will sell or how it will work out. You are in uncharted territory for me and I wish you well. The OC cannot help and cannot guarantee your success!!