A usufructuary shall not be entitled to significantly alter
the substance or form of the property obtained under the provision
of usufruct or to destroy such property, except with the owner's
prior permission.
194
Provided that if the enjoyment of the property given under
the provision of usufruct is not possible without an alteration in the
form of or destruction of the property, except as otherwise provided
for in the contract, the property may be enjoyed by altering its form
or destroying it, on payment of the price that may be set at the time
of returning such property.