The construction costs for Finch/Hurontario are a bit over $100M/km.
From UT: "In April,
Infrastructure Ontario (IO) and
Metrolinx had selected a consortium,
Mosaic Transit Group, as their preferred proponent for the project. This week, Mosaic reached commercial and financial close to design, build, finance and maintain the 11-kilometre LRT. The $2.5 billion contract includes $1.2 billion of construction costs. The
Toronto Transit Commission will operate the line for Metrolinx."
From Railwayage: "The Mobilinx consortium, consisting of Hitachi Rail, Astaldi Canada Enterprises Inc., Salini-Impregilo S.p.A., John Laing Investments Limited, Transdev North America, Inc. and Amico Concessions Inc. and Bot Engineering & Construction Ltd., has signed a C$4.6 billion DBFOM (design, build, finance, operate and maintain) contract with Infrastructure Ontario and Metrolinx for the Hurontario LRT. The contract value includes approximately C$2.1 billion in total capital construction costs."