[IAUOLENUS libro quinto ex posterioribus LABEONIS.] §18.1.79.prFundi partem dimidiam ea lege uendidisti, ut emptor alteram partem, quam retinebas, annis decem certa pecunia in annos singulos conductam habeat.
[JAVOLENUS, in the fifth book of his Last Works of LABEO.] You sold half of a tract of land on the condition that the purchaser should lease the other half, which you retained, for ten years at a certain sum of money for each year.
Labeo et Trebatius negant posse ex uendito agi, ut id quod conuenerit fiat.
Labeo and Trebatius deny that an action on sale can be brought to have that which was agreed upon performed.
ego contra puto, si modo ideo uilius fundum uendidisti, ut haec tibi conductio praestaretur: nam hoc ipsum pretium fundi uideretur, quod eo pacto uenditus fuerat: eoque iure utimur.
I, on the contrary, think that it can, provided that you sold the land cheaper for the very reason that this lease should be performed to you; for that very fact, that it was sold under such a pact, would seem to be the price of the land; and this is the law we use.