▁fert il izer ▁and ▁salt ▁company ▁K + S ▁for ▁a ▁total ▁enter prise ▁value ▁of ▁US $ 1 . 7 ▁billion . ▁The ▁sale , ▁completed ▁by ▁October ▁ 2 0 0 9 , ▁was ▁in ▁conj unction ▁with ▁the ▁Dow ▁Chem ical ▁Company ' s ▁take over ▁of ▁R oh m ▁and ▁Ha as . ▁ ▁Fac ilities ▁and ▁logo ▁The ▁Mort on ▁Salt ▁Company ' s ▁current ▁headquarters ▁office ▁is ▁in ▁the ▁River ▁Point ▁building ▁at ▁ 4 4 4 ▁West ▁Lake ▁Street ▁in ▁Chicago , ▁becoming ▁its ▁first ▁ten ant ▁in ▁December ▁ 2 0 1 6 . ▁Its ▁previous ▁headquarters ▁was ▁at ▁ 1 2 3 ▁North ▁W acker ▁Drive . ▁Prior ▁to ▁its ▁ac quisition ▁in ▁ 1 9 9 9 , ▁the ▁firm ' s ▁corpor ate ▁headquarters ▁was ▁at ▁ 1 0 0 ▁North ▁R ivers ide ▁Pla za ▁( l ater ▁the ▁headquarters ▁of ▁Bo eing ) ▁and ▁before ▁that ▁at ▁ 1 1 0 ▁North ▁W acker ▁Drive ▁and ▁ 2 0 8 ▁West ▁Washington ▁Street ▁Mort on ▁oper ates ▁a ▁research ▁& ▁development ▁labor atory ▁in ▁El gin , ▁Illinois , ▁and ▁produces ▁salt ▁at ▁eight ▁vac u um ▁ev ap oration ▁plants , ▁six ▁under ground ▁mines , ▁five ▁solar ▁ev ap oration ▁plants , ▁and ▁five ▁pack aging ▁facilities ▁across ▁the ▁United ▁States , ▁Canada , ▁and ▁The ▁Bah am as . ▁ ▁Ac quired ▁in ▁ 1 9 5 4 , ▁the ▁company ▁own s ▁the ▁second - larg