The simplest solution is to put a notice (with permission) on the noticeboard.
The 2nd simplest solution is to inspect the Strata Roll at the SM’s premises.
All Lot Owners names and addresses should be there.
You are entitled to write down anything you like.
I too remember the days when local Councils kept a rates book.
Don’t know whether it’s just “progress” or the Privacy Act which means they no longer do or no longer allow ratepayers to look at it.
The 3rd solution is to get on to the LPI website. Pay for each search and you can find out a lot. Apparently money trumps privacy.
Although, in my opinion, a lot of people confuse “anonymity” with “privacy”.