Building on Someone Else's Land

Question
A man built a mosque on land that belongs to someone else without the owner's knowledge, and the owner only found out after the construction was completed. What is the ruling on this construction?
Answer
I say, and with God's help: this is considered usurpation, so it is necessary to compensate the owner for the value of the land if the owner did not donate the land to the mosque, and God knows best.
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