Here is a Tutlrilal for staircase with landing on the foundation. I think  this is easier . : )

Here is show you staircase with landing on the foundation. This staircase is U shape. but possible L shape, also T shape. You can put windows here without problem. You can see this stairs at Shaby Chic House,Design Studio House, White Palace , Dorm Vol.01,Student UnionVol.01 ,,,(Pop up to new windows) This time I'll show you how to make same one with this photo. Let's try !! I always decide where to create the stair , after create outline of  house. So, this time try as usually.   you create outline house.  It's ok not for perfect. and decide place to stairs and landing. 1, so make wall around the place for landing by wall tools.   like white line on this picture.( on this case by 4 tiles) It's need one squar free space from every walls. Go out side of this staircase. 2,Use down elevation tools with mediam area, and click 8 times in quickly. (this can change 6times also 10times,,,) and here create foundation and wall  near the landing place. . 3, Make Cheat Comands box, press in same time Shift  key + Ctrl Key + C key Here type boolprop constrainfloorelevation false. and Enter press. false means free floor elevation comands  on. 4, and use flat tools, drag  to arrow till wall of landing like this pic. Landing is complate , and now need flat around wall of edge house. Cheat comands still false. 5, use flat tools and drag from 2nd floor to arrow, out line of walls. important is don't flat next squar from landing! 6, if you can't drag to flat , so make wall outside  for help. 7, use flat tools and drag outside of wall as before. 8,use flat tools and drag from room side to arrow. If you can well, so make cheat comands box.    press Shift key + Ctrl key + C key  in same time. and Type here boolprop constrainfloorelevation true true means off the comands of free floor elevation comands. and placed stairs and walls around the 2nd floor and decorate this place like this.    If you can't cover  the roof  where placed railing.   so, type cheat comands boolprop constrainfloorelevation false again. use flat tools and make flat from top like this.   This is necessary for making 3rd floor also. After this don't forget type cheat comands boolprop constrainfloorelevation true : ) completion!!    Good job?!! ^^ You can see this stair case at petit house VOl.07 Hope you can make it well!! : )

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