Electronic Open Competition, In Euro, With The Criterion Of Awarding The Most Economically Advantageous Bidding On All Services, For The Selection Of A Contractor To Undertake The "Provision Of Guard Services: A) For The Building Of The Central Office Of The Ministry Of Infrastructure And Transport, On The Contribution Of Anastasiou Streets 2 & Amp; Tsigante, Papagos, B) For The Building Of The Road Fees Service, At 14-18 Vitinis Street, N. Philadelphia And (C) For The Facilities Of The Dcc, At 166 Piraeus Street, Athens, For A Period Of Two (2) Years, With The Possibility Of An Option.