A duplex flat is a type of apartment or housing configuration that allows for two separate residential units within one structure. In New York City, a duplex is defined as an apartment with two floors that are connected by either stairs or an elevator. The lower level of a duplex apartment can sometimes be a basement. Both floors must have a legal minimum ceiling height of 8 feet, and the interior layouts of the two units are usually identical. Duplex apartments are often owned and occupied by one resident or a large household and are a hot commodity in crowded cities like New York. They are great for families, with the separation of space and a home-like feel, and there is more privacy in these units as bedrooms can often be on different floors. Duplexes can also be used for a variety of purposes, such as artists’ showrooms, salons, and events.