Learn Farsi: جمعیت منطقه می‌روند، چون محله رو به اعیان‌سازی است. - The area's population are leaving, because the neighborhood is heading towards gentrification.

The phrase رو به literally means "face to" or "facing". When you combine it with an abstract noun like اعیان‌سازی (gentrification) and the copula است (is), it creates a trajectory construction. It shows that the subject is in the ongoing process of changing, translating smoothly to "is heading towards" or "is undergoing".

How is the word اعیان‌سازی (gentrification) formed?

It is a compound word made of اعیان (the wealthy, elites, or nobles) and the suffix سازی (making or building, derived from the verb ساختن). Literally meaning "elite-making," it is the standard Farsi term for gentrification. You will see this سازی suffix often at the B2 level to form abstract nouns related to development, industrialization, or transformation.

Why does جمعیت (population) take the plural verb می‌روند?

In Farsi, collective nouns that refer to groups of human beings, such as جمعیت (population) or مردم (people), typically take a plural verb. This is because the speaker is emphasizing the multiple individuals acting within that group rather than treating the group as a single inanimate block.

Does می‌روند simply mean "they go" here?

While the verb رفتن literally means "to go," using it without a stated destination often carries the meaning of "to leave" or "to move away." In the context of the neighborhood changing, they aren't just going somewhere specific; they are departing the area entirely.