Definition : Nadir

Point located in the center of the Earth, opposite the zenith. In terms of real right, it is the lowest point in the field that can be appropriated. When a lot is located in a horizontal cadastral plan, it generally includes, unless otherwise indicated, all the space below, up to the nadir.

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By purchasing a condo (apartment) in a residential tower, you automatically become an owner in a vertical co-ownership. You can also be in a divided co-ownership, if you purchase a house (semi-detached or townhouse), built on the same lot than other individual homes.  It is then called a horizontal co-ownership.
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