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
It is far more difficult to perceive how matters stood with landed property on a larger scale. The fact that such larger properties existed to no inconsiderable extent, cannot be doubted from the early development of the -equites-, and may be easily explained partly by the distribution of the clan-lands, which of itself could not but call into existence a class of larger landowners in consequence of the necessary inequality in the numbers of the persons belonging to the several clans and participating in the distribution, and partly by the abundant influx of mercantile capital to Rome.
But farming on a large scale in the proper sense, implying a considerable establishment of slaves, such as we afterwards meet with at Rome, cannot be supposed to have existed during this period. On the contrary, to this period we must refer the ancient definition, which represents the senators as called fathers from the fields which they parcelled out among the common people as a father among his children; and originally the landowner must have distributed that portion of his land which he was unable to farm in person, or even his whole estate, into little parcels among his dependents to be cultivated by them, as is the general practice in Italy at the present day.
The recipient might be the house-child or slave of the granter; if he was a free man, his position was that which subsequently went by the name of "occupancy on sufferance" (-precarium-). The recipient retained his occupancy during the pleasure of the granter, and had no legal means of protecting himself in possession against him; on the contrary, the granter could eject him at any time when he pleased. The relation did not necessarily involve any payment on the part of the person who had the usufruct of the soil to its proprietor; but such a payment beyond doubt frequently took place and may, as a rule, have consisted in the delivery of a portion of the produce.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=13