The 21-year-old left-hander had previously been dismissed in the 80s or 90s on five occasions in the 2nd XI competition, but ensured his maiden century at that level was a memorable one as the QAS amassed a mighty first innings total after bowling out the visitors on Monday for 190.
Street finished with 345 after going to lunch just shy of the 300 run mark.
Street and his Sandgate-Redcliffe teammate Charlie Hemphrey, who also reached three figures with 151, combined for a third wicket partnership of 412 on day three today.
It was the first triple century for Street who had achieved a double century for the Gators in 2016-17 when he scored 234 not out.
The QAS declared their first innings at 4-645.
Victoria were unable to capitalise on a sold start to the game with Queensland Bulls players Cameron Gannon and Mitch Swepson each claiming four wickets.
Street, who has spent the past two off-seasons playing in the Netherlands, has been a rookie contracted player with Queensland since 2016-17.