Also the whole of his Slaves amounting to 57 in number.
These slaves worked along side borrowed slaves from surrounding farms and free blacks and whites. Together they did the brunt of the building of the "Academic Village". Jefferson and a majority of the visitors had ambivalent views on slavery. We know Jefferson had an urge to include freeing slaves in the Declaration of Independence but was removed by his peers; however, he himself still owned slaves. This ambivalent attitude continued at the University after it's construction, by allowing free blacks to work in facilities and still owning some slaves that worked in facilities. Another interesting point to make is that UVA allowed faculty to bring personal slaves to grounds yet forbid students to bring their own slaves onto grounds, because of Jefferson's view that,"slavery raised the young in habits of tyranny".
https://www.encyclopediavirginia.org/Slavery_at_the_University_of_Virginia