There are just too many variables to average out a common levy.
You have two blocks the same size land size but one has 12 lots and the other 20. The lower lot number will have higher levies as they get in less than the other block.
Levy compliance. The smaller the lot number the bigger the levy if you have recalcitrant owners who wont pay and you have to chase them to court.
Building age. Older buildings can have bigger repair bills because the building code of today is far different. Repairs can get complicated replacing old and now non compliant infrastructure.
Management. You can have nice looking quarterly levies set, but discover that’s because your OC set aside next to nothing in your capital works fund. One building I know had a grand total of $200 per annum per owner set aside for capital works in a building of 18 lots. Special levy here I come.