We live in Afula & on our side of the building we are the only Jews & the other owners are Russian Goyim so why should our entrance require a mezuzah &why should I foot the bill for Goyim who are not required to do the mitzvah of mezuzah? Yes I am 100% sure that they are not Jews& all my doorposts in my apartment have mezuzot so why does our entrance need it when they are Goyim?

Shalom Uvracha, If you are askenazim you don't have to put a mezuza. If you are sefardim you have to put a mezuza (see Shulchan aruch and Rema Yoreh deah (286;1). Comment: Some of the Ashkenazi Poskim hold that one should put a mezuza in this situation. All the best!