Known as San Pedro Heights during the 17th century, the area was mostly home to the city's growing contingent of dockworkers and brickmakers; the area became Buenos Aires' first "industrial" area, home to its first windmill and most of the early city's brick kilns and warehouses. The bulk of the city's exports of wool, hides and leather (the Argentine region's chief source of income as late as the 1870s) were prepared and stored here in colonial times. Their presence led to the first residential settlements in this area: that of Africans, slaves and free, alike.