Create a copy of your terrain perimeter and used the concentric resize to create the setback lines for your lot.
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Terrain and Site Plans
75 - Terrain & Site Plan Basics
49 - Creating a Terrain Perimeter
250 - Adding Terrain Elevation Data
52 - Terrain Features
242 - Trace a Terrain Lot Image to Create a Site Plan or Terrain Perimeter
1056 - Import a Surveyor DWG file for a Site Plan or Terrain Perimeter
411 - Terrain Contours Absolute Elevations vs. Sea Level Elevations
412 - Creating Sloped Terrain and Adding Retaining Walls
51 - Creating a Walkout Basement
1930 - Creating a Site Plan or Plot Plan
413 - Creating Terrain Setback Lines
414 - Placing a Plan Footprint on a Site Plan
192 - Creating Procedural (3D) Grass
53 - Plant Chooser
2424 - Distributing Objects Along a Path or Region
2425 - Converting CAD to Distribution Paths or Regions