5 6 3 . ▁ ▁The ▁for tr ess ▁was ▁dem il itar ized ▁only ▁at ▁the ▁end ▁of ▁the ▁eigh teenth ▁century , ▁at ▁which ▁point ▁it ▁became ▁part ▁of ▁the ▁city ’ s ▁public ▁life . ▁▁▁ ▁In ▁ 1 9 3 7 , ▁following ▁a ▁major ▁rest oration , ▁the ▁for tr ess ▁was ▁transformed ▁into ▁its ▁present ▁condition ▁as ▁a ▁public ▁park . ▁▁ ▁It ▁houses ▁an ▁ ▁En oteca ▁( a ▁commercial ▁center ▁focused ▁on ▁the ▁local ▁wine ▁industry ) ▁and ▁frequently ▁hosts ▁art ▁exhib itions . ▁▁ ▁It ▁is ▁also ▁used ▁for ▁festiv als ▁and ▁concert s ▁and ▁is ▁home ▁to ▁the ▁S ien a ▁Jazz ▁foundation . ▁ ▁Str ucture ▁ ▁Origin ally ▁built ▁on ▁an ▁“ L ” ▁sh aped ▁foot print , ▁the ▁for tr ess ▁was ▁subsequently ▁transformed ▁into ▁its ▁current ▁rect angular ▁form . ▁▁ ▁On ▁each ▁of ▁the ▁four ▁corners ▁is ▁an ▁impos ing ▁brick ▁built ▁r amp art , ▁and ▁on ▁three ▁of ▁these ▁the ▁Med ici ▁coat ▁of ▁arms ▁stands ▁above ▁the ▁head ▁of ▁a ▁l ion . ▁▁ ▁On ▁the ▁fourth , ▁south ▁facing ▁corner , ▁however , ▁there ▁is ▁only ▁the ▁head ▁of ▁a ▁l ion . ▁ ▁The ▁for tr ess ▁is ▁a ▁substantial ▁structure , ▁with ▁internal ▁dimensions ▁of ▁approximately ▁ 1 8 0 ▁by ▁ 1 2 5 ▁meters ▁and ▁external ▁dimensions ▁of ▁about ▁ 2 7 0 ▁by ▁ 2 0 0 ▁meters . ▁▁ ▁If ▁the ▁outer ▁wall ▁is ▁included , ▁the