Logic of sustainable architecture

The paper deals with the ontological essence of environmentally sustainable architecture, which is based on the UN concept of sustainable development and the holistic vision of the world. The author interprets the concept of «seamlessness», which Heidegger reveals through analysis of essence of technique in the works of the 50-ies of XX century, using an ontological approach, revealing the idea of necessity. These works of the philosopher are relevant in our time. The author introduces the concept of «environ», which is the essential necessity for sustainable architecture, its determining principle. Six different models of a particular environ are identified, which cause the respective tasks: the choice of a scientific or aesthetic approach in the design, materials and technologies, determine the image of buildings. These environs - namely, global world, natural environment, social, metaphorical, medical, cultural determine the appropriate design logic. Thus, the author offers a new ontological approach to the consideration of communications and relations of the sustainable architecture in the unity of its logics.