A jr 1 bedroom can be a very advantageous layout. In a trendy neighborhood like the West Village or the Lower East Side, you might see many former industrial buildings with high ceilings converted into studio lofts with wide open layouts.
As a result, you might not have a built-in, legal bedroom to work with. Sometimes the layouts or the window placements won’t come together to give you a natural, separate, legal bedroom.
So putting up a wall and creating a junior 1 bedroom apartment is a great way to give yourself some privacy, and to separate the sleeping quarters from the living quarters.
Furthermore, in neighborhoods like the Upper East Side with older buildings that don’t have quite as high ceilings, you will get more bang for your buck by buying a jr 1 bedroom vs a legal 1 bedroom apartment.