Jews were stripped of citizenship after 1933, so in fact they were. Quite similar to how citizens of US have European, African, etc. heritage but are still citizens.
You need a plausible excuse for the camps after all, as I'm sure you're well aware.
Also, acquiring real estate for any org to for any activity is also normal. E.g a town government who buys a warehouse to house a temporary school or hospital.
Bloomberg is just trying to insinuate analogies here because their political party didn't win.