Economic Sustainability

So my tree officially has ZERO leaves on it. But if you look closely, you can see there is a birds nest in my tree! The economic environment surrounding my tree is basically just the apartment complex that I live at. The management placed the trees to help promote economic sustainability so that it was more appealing to people considering to sign a lease with them. If there were no trees, then it would look less appealing and a lot more bare which would not promote economic sustainability. Basically, the more trees that are surrounding apartment buildings, the higher the occupancy rates.