@fbaezer,
East of Las Lomas, there is another upper class neighborhood, Polanco.
A few decades ago, it was mostly residential, and mostly houses like this one:
Now, only a few of those mansions remain, often as stores, and a lot of buildings have surged. This is the Polanco skyline:
It's still ritzy, but not as much as Lomas, full of stores, restaurants and other businesses, and has terrible traffic.
This is Presidente Masaryk, the avenue of "nice stores".