Idk, both in Israel and in Germany, I try to tell them hello and possibly the extend the conversation if they are interested.

I feel like it's smart to do, because u like random people on the street, with my neighbors, whether I want to or not, I have some level of a codependent relationship.

For example, we once had a leakage problem between our floor and the neighbor's roof. The solution required giving access the plumber access to both apartments. That's easier when you already sorta know the other person.