Is a landlord of a large rental building, where people of all denominations live, allowed to put a mezuzah on the entrance of the building ? It seems to me that the mezuzah indicates that the building is a Jewish building, but there are many non Jews and secular Jews living in the building, many of whom object to the presence of the mezuzah. If the building had been owned by a Hindu, the corresonding symbol would be a swastikah, turning in the direction opposite to the way it is displayed by the Nazis. In fact Hindus often do put this symbol in their homes, indicating prosperity , to the consternation of those ignorant of their practices, just as many non Jews are ignorant of the meaning of the mezuzah. I am interested in how you would interpret this situation.
The Ramma in Yoreh Deah siman 286 siff 1 brings the Mordechai and Aguda who say a house, yard or city which has some non-Jews is absolved from the mitzvah of mezuzah.
The Taz #3 there brings the reason as being a danger if the no-jews become afraid that there is magic being performed against them, as found in maseches Yoma 11.
The mezuzah is not put on the bulding to "indicate that the building is a Jewish building" (as far as I know)
It is put their to fulfill the commandment and for protection.
If it causes problems (consternation) we hide it in the doorpost (in America it usually does not cause problems)
"swastikah, turning in the direction opposite to the way it is displayed by the Nazis", does not bother me/us (if it is pagan I will just avoid looking on it)