A foldable table assembly has a base frame formed by transverse lower base pieces, longitudinally opposing pairs of spaced-apart upright pieces having pivot mounts on their upper ends, longitudinal stretchers extending between the upright pieces, and end sections between the upright pieces defining a centerline of the assembly and having leaf stops on their upper ends, for independently holding respective table leaves mounted by pivot pins to the pivot mounts on each transverse side of the centerline. The tables leaves have a total span greater than the width of the upright pieces, and fold vertically for storage within the width of the upright pieces. A longitudinal upper shelf is provided on one transverse side supported by upright posts at the centerline above the corresponding table leaf, and is foldable to a vertical storage position. Round banquet table leaves can be interchangeably mounted in place of rectangular buffer table leaves by removing the pivot pins from the pivot mounts.