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I have read a sentence like this and I wonder why the writer used "of" right after the verb "to be" Is it okay to use be+of? And what did he mean by using like this?

The concept is of multi-storey buildings in which food crops are grown in environmentally controlled conditions.

  • It means that something has been said earlier in the text. And then here they are pinpointing it: The concept concerns x, would be the same thing. – Lambie Feb 1 '18 at 1:35
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The sentence has been taken from here.

Although the sentence is grammatically correct, I find it to be rather poor. Subject complements starting with "of" are indeed infrequent. I would have suggested changing it to:

  • One such proposal is for the 'Vertical Farm', based on the concept of multi-storey buildings in which food crops are grown in environmentally controlled conditions.

OR

  • One such proposal is for the 'Vertical Farm', which consists of multi-storey buildings in which food crops are grown in environmentally controlled conditions.

OR

  • One such proposal is for the 'Vertical Farm', which has been conceived of as multi-storey buildings in which food crops are grown in environmentally controlled conditions.

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