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By default you should be able to display Property Lines in any plan view [including ceiling plans]. As long as V/G > Model Categories > Site > Property Lines is checked, they should display from above or below.
I have included an example below:
Video Example: http://screencast.com/t/zLmhwXoSYE
If you do not see the Property Lines in the view, try toggling Reveal Hidden Elements to see if they have been hidden.
Thank you,