I have been told that all electricians and in particular local ones hold keys to fit all strata electricity Meter Rooms. Not sure how it works but I suppose it is some sort of common lock set-up. You can understand locksmiths being a bit cagey about it (no pun intended) but maybe it needs to be suggested to your Strata Manager he / she needs to be a little more helpful and also the Chairman.
Do you really want to have key to the Meter Room? Remember James Spader’s great line in Sex, Lies and Videotape where he says he doesn’t ever want to have keys to anything because it’s too much responsibility.