Working in a 2nd ring suburb of Chicago (built mostly between 1960-1980) there is a ton of split level houses - be they bi-level, tri-level, or quad-level - they are very prevalent.
My question is simply - what is the point (advantage) of this design of houses?
I personally despise these houses as rather annoying and pointless.
What is you opinion/experience?
Here are some examples:


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The approach in your place maybe different to ours, here, split-level is a design solution to break long flight of steps. Another reason is to fit the house wherein it's either an uphill or a down hill site utilizing the natural grade of the site. Also, the height of the cathedral ceiling will give a more spacious and grandeur effect to the foyer. If they raised the floor of the rooms although the terrain is flat, maybe the underground is used as utility area, maybe there's an space for heating ducts for this purpose.