According to Harav Yosef Sholom Elyashiv zt"l: (Ashrei Ha'ish)
Lighting Chanukah Menorah in front of the City Hall, Parliament
buildings or other public places etc. makes no sense whatsoever
even if your intention is to publicize the Neis of Chanukah.
Chazal instituted Pirsumei Niseh, where, when and how.
Anywhere else*, there is absolutely no Mitzvah to do.
Those who light there with a Brocho are oiver on Brocho Levatalah"
*even putting a Menorah on the rooftop of a car. אמבצי