Is your dog certified as an emotional support dog? If so, you should only need to show your papers and all should be fine. Maybe you could call the ADA and ask them if there is a rule on apartments and visiting? Since this is not a public building like a shopping center or place to eat there may be no rules regarding private buildings.

We have an assist dog but she's not certified. We trained her for hubby. We don't usually take her in public places because of that.