Answers:
Perhaps it's because the complexes want to sound very secure and safe for the tenants, so they put "arms" there to have people imagine knights guarding them or something.
Also some old families had/have a 'coat of arms', usually hanging over the door or fireplace or other "place of pride," because it shows the strengths of their families (lions rampant, [is that the word?] etc) and the old age of their said dynasty.
So apartments will go for that selling point, too.
They welcome you to live there with "open arms" & you feel protected by being held within someone's "arms."
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