The Loft, which originally constituted a type of clandestine life, has become a concept applicable to large, renovated spaces, where the existing structure has been incorporated into everyday architecture. Consequently, old factories, storage areas and warehouses are being transformed to create homes and offices, or commercial studios and shops. The original architecture of these spaces is characterized by the use of materials such as concrete, aluminum, marble and wood, with smooth walls and large doors and windows. The decoration in lofts emphasizes simplicity, adaptability and functionality to create open-plan spaces, with separate rooms being formed using folding screens, medium-height walls or simply pieces of furniture. There are currently two trends: constructing new homes in the style of lofts, and recycling and re-using those already built as a further step in the development of sustainable architecture.