Sustainability in the buildings consists of 3 main parts: social, environmental and economic.
Building is not just a space between the walls. People consider it as home, office, favourite grocery store or some other unique place. People relate to the buildings.
Buildings do have great impact on the environment. Luckily, green buildings can do some good by doing well. They should no longer be seen as a cost, but investment that pays off. Efficiency equals to high performance both financially, and environmentally.