I spy with my little eyes, looking at it from a building perspective my answer for this week's "spy" is INFRASTRUCTURES

Why did I choose this word?
It relates to the cues given

• it is 15 letters
• infrastructure is the backbone for every build up in the society.
• it is really interconnected with many other components, like the transportation infrastructure depends on the communication network to work efficiently.
• we have private infrastructure and public infrastructure, depends on what is being worked on.