MSbuild Error: The builds tools for v140 (Platform Toolset = 'v140') cannot be found

Question

I have a solution which is consists of a large number of projects (C++ and C#). I upgraded the solution to VS2015, so the toolset version for most of them are now set to V14

Answer 1

Jacob's answer worked for me but C++ build tools were under VS Build Tools 2017 while I had VS 2019 Installer on Windows 10 as at July, 2019.