▁Avenue ) ▁between ▁Presidente ▁R oca ▁and ▁Min istro ▁Gon zá les ▁streets . ▁Selected ▁for ▁its ▁location ▁on ▁the ▁center ▁of ▁the ▁city , ▁at ▁the ▁time ▁the ▁round about ▁hosted ▁another ▁monument , ▁the ▁Found ational ▁Py ram id . ▁The ▁py ram id ▁was ▁moved ▁to ▁the ▁former ▁grounds ▁of ▁the ▁old ▁town ▁hall . ▁ ▁The ▁construction ▁works ▁started ▁soon ▁after ▁to ▁inaugur ate ▁the ▁San ▁Martín ▁Monument ▁on ▁September ▁ 1 2 , ▁ 1 9 5 4 , ▁the ▁city ' s ▁ 5 0 th ▁anni versary . ▁ ▁The ▁rep lica ▁statue ▁was ▁sent ▁from ▁Buenos ▁Aires ▁via ▁the ▁Great ▁Southern ▁Railway ▁( ). ▁The ▁body ▁of ▁the ▁bron x ▁statue ▁was ▁built ▁h ollow , ▁while ▁the ▁tail ▁of ▁the ▁horse ▁was ▁filled ▁to ▁offset ▁the ▁weight ▁of ▁the ▁structure . ▁The ▁base ▁of ▁the ▁monument ▁was ▁built ▁by ▁the ▁Italian ▁company ▁Fal con e ▁S . R . L , ▁under ▁the ▁direction ▁of ▁hyd ra ul ics ▁and ▁civil ▁engineer ▁José ▁Antonio ▁Al onso . ▁Al onso ▁also ▁completed ▁the ▁move ▁of ▁the ▁Found ational ▁Py ram id . ▁The ▁base ▁was ▁covered ▁with ▁white ▁lim estone ▁brought ▁from ▁Z ap ala . ▁ ▁For ▁its ▁inaug uration ▁on ▁September ▁ 1 2 , ▁ 1 9 5 4 , ▁the ▁base ▁of ▁the ▁monument ▁was ▁covered ▁with ▁Argent in ian ▁flags , ▁since ▁the ▁works ▁on ▁the ▁lim estone ▁were ▁not ▁finished ▁and ▁the ▁internal ▁br icks ▁were ▁visible . ▁The