Our climates are pretty similar... Buenos Aires is at 34°34'S latitude and 20 feet elevation while Los Angeles is at 34°3'N latitude and 256 feet elevation.
Here's a comparison of our climates...
Buenos Aires
Los Angeles
Doing a side by side comparison it seems that the weather here in Los Angeles is slightly hotter and colder than the weather in Buenos Aires. So pretty much any orchid that we can grow outdoors year around you should be able to grow outdoors year around. But there might be a few of your outdoor orchids that might not tolerate our wider range of temperatures.
Sydney is also fairly close "sister" climate but
Cape Town is probably a little bit closer.
Thanks for sharing those photos of your growing space.