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Pluralistic: "If buying isn't owning, piracy isn't stealing"
(pluralistic.net)
This is a most excellent place for technology news and articles.
The architectural design is Intellectual Property and you've got a time-limited license to use it.
Absolutelly, the land is yours, as are the materials the house is made from, but you'll have to pay extra for continued use of that design once your license expires.
PS: This is how I imagine the argument would be made.