Step 1: Switch to Site Plan View
You can create the property line in any other plan view, but since we're going to create a site element, it's always a good idea to switch to site view. You'll see the project base point & survey point that look like a Circle & triangle respectively. These two points will be very useful later on to define project location, coordinates & elevation.
Now switch to the 'Massing & Site' tab, select 'Property Line' tool from 'Modify Site' panel.
If you know distances & bearings of the property lines (used in some contries to draw maps & define properties), use the first method. If you have a sketch including dimensions, angles or diagonals, use the second. In this tutorial, I will use the sketch method.