1954 House Bill 1815. An Act Providing For The Construction, Maintenance, Repair And Operation Of An Underground Garage For The Parking Of Motor Vehicles Under Boston Common, Charles Street And The Public Garden, Or Any Of Said Places, In Said City Including A Tunnel From Commonwealth Avenue At Arlington Street Connected Therewith And An Underground Passageway From Said Garage To Tremont Street, Providing For The Creation Of The Common Garage Authority And Defining Its Powers And Duties And Providing For The Financing Of Said Project.