My building and the one next door share what is called a pulmon de manzana. Manzana usually means apple, but in this case it means a block. So the phrase means the lungs of the block.
It is a common garden, usually quite lush with palm trees and other greenery. This is the one I see from my balcony, and in fact from my living room window.
I’m on the 3rd floor, which in Canada would be the 4th floor as the street level is called the planta baja and doesn’t have a number.
There are quite a few dogs in the two buildings, and when I looked down this morning these three were relaxing in their personal backyard!