http://agathe.gr/guide/middle_stoa.html
Middle Stoa The appearance of the south side of the Agora was radically changed during the 2nd century B.C. with the construction of several new buildings. This South Square, as it is called, was made ... Middle Stoa The appearance of the south side of the Agora was radically changed during the 2nd century B.C. with the construction of several new buildings. ... The new square can best be understood from the so-called East Building, just north of the Church of the Holy Apostles. ... Traces of a narrow parapet that ran between some of the columns can be made out on individual drums.