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If the building manager speaks from experience, get a wired mic and use it. If he speaks from a suspicion based on what he thinks will happen owing to whatever it is he’s referring to as “pink noise,” take your wireless gear into the environment and do a test for yourself. Find out what the noise does to your audio; experiment to determine whether you can minimize the noise in post.
If this truly is “pink noise” — as defined in physics — it will be producing interference over a broad spectrum and probably can’t be defeated easily. If it’s merely a hum, like a 60 cycle line hum, you can probably clean it up in post.