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I wanted to build a building like the picture and what I did was putting two cubes on top of each other . I want know how this can be made from one cube I mean start from one cube and extrude or ... enter image description here

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  1. Enter edit mode
  2. Hit Ctrl-R to make a loop cut across the mesh.
  3. Repeat in other direction
  4. Select face and extrude it upwards(E-Z)

enter image description here

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  • $\begingroup$ how do you make these videos? $\endgroup$ – pluke Feb 9 '15 at 21:09
  • $\begingroup$ @pluke You can use either licecap (@gandalf3's suggestion) or gifcam cegton's suggestion. I used keypose for the shortcuts. $\endgroup$ – GiantCowFilms Feb 9 '15 at 21:22
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In Edit Mode select the upper face and snap the cursor to it (press Shift+S-->Cursor to Selected). enter image description here

Press E to extrude and then S to scale the extrusion. Confirm the operation with Enter. enter image description here

Extrude once more along z axis. Press E, then Z and confirm the transformation. enter image description here

Now select the whole extruded element and place it wherever you like, using G and choosing the axis you like. enter image description here

And here it is. enter image description here

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    $\begingroup$ you can also extrude faces like that using inset. select the face(s) and "i", then move mouse to change size. $\endgroup$ – Bithur Feb 8 '15 at 15:07
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If you do not want to mess with the topology of the lower part of the building, you can build them separately, select both, and join them with Ctrl+J.

Join Meshes

Another option is to select the top face and duplicated it with Shift+D.

Duplicate

You will then be able to edit the different parts with complete flexibility, with no fear of ruining your work on the other parts of the building.

Edit

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