Depends on how you define economics. It's the study of production, distribution, and consumption of goods and services, which absolutely includes common goods like green space, pedestrian access, and other factors that are becoming even more important parts of city planning.
Even if you look at some of these elements as purely aesthetic or quality of life factors, that's still something economists regularly analyze, even when it might not have traditionally been the case.
Even if you look at some of these elements as purely aesthetic or quality of life factors, that's still something economists regularly analyze, even when it might not have traditionally been the case.