Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Under it all the state-lands which were occupied and enjoyed by the possessors without remuneration--those that were let on lease, such as the territory of Capua, were not affected by the law--were to be resumed on behalf of the state; but with the restriction, that each occupier should reserve for himself 500 -jugera- and for each son 250 (so as not, however, to exceed 1000 -jugera- in all) in permanent and guaranteed possession, or should be entitled to claim compensation in land to that extent. Indemnification appears to have been granted for any improvements executed by the former holders, such as buildings and plantations.
The domain-land thus resumed was to be broken up into lots of 30 jugera; and these were to be distributed partly to burgesses, partly to Italian allies, not as their own free property, but as inalienable heritable leaseholds, whose holders bound themselves to use the land for agriculture and to pay a moderate rent to the state-chest. A -collegium- of three men, who were regarded as ordinary and standing magistrates of the state and were annually elected by the assembly of the people, was entrusted with the work of resumption and distribution; to which was afterwards added the important and difficult function of legally settling what was domain-land and what was private property.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=39