[ULPIANUS libro septimo decimo ad Sabinum. ] §7.4.5.prRepeti potest legatus usus fructus amissus qualicumque ratione, dummodo non morte: nisi forte heredibus legauerit.
[ULPIANUS from the seventeenth book on Sabinus.] A bequeathed usufruct that has been lost for any reason whatsoever can be claimed again, provided it was not by death; unless perhaps the testator bequeathed it to the heirs.
§7.4.5.1Si quis usum fructum solum serui alienauerit, per quem usus fructus ei adquisitus est, dubium non est, quin usus fructus per eum adquisitus retineatur.
If anyone has alienated only the usufruct of a slave through whom a usufruct was acquired for him, there is no doubt but that the usufruct acquired through him is retained.
§7.4.5.2Rei mutatione interire usum fructum placet: ueluti usus fructus mihi aedium legatus est, aedes corruerunt uel exustae sunt: sine dubio extinguitur.
It is accepted that a usufruct perishes by a change in the thing: for example, the usufruct of a house was bequeathed to me, and the house collapsed or was burned down: without doubt it is extinguished.
an et areae? certissimum est exustis aedibus nec areae nec cementorum usum fructum deberi.
Does this also apply to the site? It is most certain that when a house has been burned down, a usufruct is due neither of the site nor of the materials.
et ita et Iulianus.
And Julian also holds this.
§7.4.5.3Si areae sit usus fructus legatus et in ea aedificium sit positum, rem mutari et usum fructum extingui constat.
If the usufruct of a site was bequeathed and a building has been erected on it, it is established that the thing is changed and the usufruct is extinguished.
plane si proprietarius hoc fecit, ex testamento uel de dolo tenebitur,
Clearly, if the owner did this, he will be held liable either under the will or for fraud.