The fit-out related MEP-systems (Mechanical, Electrical, Plumbing- systems) and the finishing (layout and furnishings). The fit-out is ideally the end users responsibility and authority, but in law systems mostly (still) the responsibility of the building owner. Fit-out (tenant work) refers to the process or action of installing building infill, or to the physical products used in making habitable space in a base building. It may also modify or describe such process or products.