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You should seek legal or other professional advice before acting or relying on any of the content here or on the internet generally.
Edit: I thought it important to mention there are free legal advice clinics set up in Qld. See link below for locations:
http://communitylegalqld.org.au/
Edit 2: happy for anyone to PM me if they do not wish to air anything out over the internet.
Commercial is certainly more lumpy and higher risk. I have a commercial unit which has been on the market for the last year now. Had one interested party who had a change of mind at the 11th hour. The unit itself is located in an inner west suburb and could be used as an office or retail space.
Previous tenant had signed a 5+5 year lease but declared bankruptcy after the first year. Not fun.