In practice, most American jurisdictions will not let one legally subdivide a living area into chunks as small as a Parisian studio. NYC regulations on how small you can subdivide are probably as generous as they get.
In the Parisian example, it is legal to have an apartment without an in-unit bathroom, and this is straight up illegal in virtually every American city. A list of requirements for NYC (not exhaustive): https://www.renthop.com/qa/nyc/what-makes-an-apartment-illeg...
In the Parisian example, it is legal to have an apartment without an in-unit bathroom, and this is straight up illegal in virtually every American city. A list of requirements for NYC (not exhaustive): https://www.renthop.com/qa/nyc/what-makes-an-apartment-illeg...