CCQ-1991 - Civil Code of Québec

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1116. At the termination of superficies, the subsoil owner acquires by accession ownership of the constructions, works or plantations by paying their value to the superficiary.
If, however, the constructions, works or plantations are equal in value to the subsoil or of greater value, the superficiary has a right to acquire ownership of the subsoil by paying its value to the subsoil owner, unless he prefers to remove, at his own expense, the constructions, works and plantations he has made and return the subsoil to its former condition.
1991, c. 64, a. 1116.