You may want to consider mentioning to the agent ahead of time that you want to see the meter room, it cuts down on the excuses. I always want to see it to take a look and show the client where it is also.
Chicago code varies a bit depending on circumstances. Essentially, if the disconnect is in the meter room then owners/tenants have to have access to it.
If there is an onsite full-time engineer or it has exterior access only then it's a little different. Usually around here though it's in the basement, which means owners need access.

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