Good questions DJ. You do not need permission, per se. There are limits on the number of overnight visits you can have, visitors must have valid identification when they visit for the first time, they have to follow building, they must be buzzed in at the front doors for your and other resident's safeties, etc. But for the most part you free to have visitors as you wish.
Yes and no. You have to have them check in at the security desk.
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