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Creating an L-shaped staircase with and without a foundation in the Sims 3 is a relatively easy process. It may take players who are new a few tries to get some of the steps just right, but they will easily catch on. This tutorial consisst of eight steps.
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If you are creating stairs without a foundation, simply begin bu building a two-story house with four walls, a wall on each side of the house. For beginners, it is easiest to have an exact corner of the house, at at least one end, because it will make it easier to create the L-shaped stairs there.
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The player should now decide where they will place their L-shape staircase. If this is the first time you are doing this tutorial, it is a good idea to place the staircase against an outer wall. It is also recommended that some floor tiles be used to mark off where the staircase will go on the ground floor.
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Using the connecting stairs, place two staircases outside. These two stair cases should be near the corner of the house where the L-shaped staircase will be. It is recommended they be placed on the third tile out from the house and the first connecting staircase should be placed three tiles behind the corner of the house (the top landing of this staircase should be the fourth tile. The second connecting staircase's upper landing should be the top staircase's lower landing.
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The two sets of connecting stairs should now be removed by clicking on them with the connecting stair tool and simultaneously holding down CTRL. The terrain will be lowered like it was when the connecting stairs were placed. Using the foundation tool, add a 1x1 square block of foundation to the lowest part of the terrain (where the lower landing of the lower staircase was). Once the foundation square is there, use the wall tool and add four walls on top of it.
If building without a foundation, remove the two connecting staircases that were just placed outside of the house by clicking on the connecting stair tool while holding down the CTRL key at the same time. The terrain will remain the way it was when they connecting stairs were placed. One the outside of the house where the bottom of the lowest connecting stair's landing was use the wall tool and place a 1x1 square of walls so that it looks like a pillar.
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First, enter the cheat code constrainFloorElevation false. Head to the houses first floor and make sure the walls are in the down position. Using the terrain leveling tool, drag it from the top of the one-story pillar you just built on the side of the house and drag it over to the house, to the corner you wish to place the stairs in.
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Take the floor tool and place one floor tile where the top of the stairs will be, and another where the corner of the stairs will be. This will create two empty tiles between the two floor tiles you just placed. You can use the top-down view to make sure that there is enough room to place the stairs.
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Once the stairs are placed on the wall, the side of the stairs on the second floor will be drooping down. To correct this, take the terrain leveling tool and drag it from the highest corner of the roof diagonally to the lowest corner.
Turn off the cheat code by entering constrainFloorElevation true. Delete the pillar on the outside of the house. Now your L-shaped stairs with or without a foundation is complete.