Select the entities that make up the building. Next
you will be prompted to name the layer and In the dialog, you can
set the layer name for the new linework, set one offset distance,
or select to be prompted for each side to offset. Also, you can set
the elevation of the envelope and trim crossing linework to ensure
you have a flat pad.
Length Snap Resolution: Will round
the dimensions of the created Building Envelope by a certain
tolerance. For example, if you select None you may get a Building
Envelope of 37.4 x 25.2. However, if you set the Length Snap
Resolution to 0.5, you will get a Building Envelope of 37.5 x 25.0.
Select building lines.
Select objects:
pick the linework that makes up
the perimeter of the building
Enter the segment horizontal
offset <0.000>: 10
Enter the segment horizontal offset
<10.000>: Enter
Enter the segment horizontal offset
<10.000>: 5
Enter the segment horizontal offset
<5.000>: Enter
Select/<Enter Elevation
<0.0000>>: 400
Draw another building envelope
[<Yes>/No]? No