The author discusses the fronting exception under ẓarf (locative) expressions, and explicitly illustrates it with the prepositional phrase «فِي الدَّارِ».
«فِي» is a preposition and «الدَّارِ» is genitive. The book uses the broader locative-predicate sense in this discussion; it is not claiming «فِي» itself is an adverbial noun.
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The Predicate of Inna and Its Sisters
The author discusses the fronting exception under ẓarf (locative) expressions, and explicitly illustrates it with the prepositional phrase «فِي الدَّارِ».
«فِي» is a preposition and «الدَّارِ» is genitive. The book uses the broader locative-predicate sense in this discussion; it is not claiming «فِي» itself is an adverbial noun.