In this articles describes how to find t4 template file path in Asp.net MVC. Here I found some solution to find the location of t4 template(in build views). In my system I have used visual studio 2012, this location depends upon the visual studio versions.
C:\Program Files\Microsoft VisualStudio 11.0\Common7\IDE\ItemTemplates\CSharp\Web\MVC4\CodeTemplates\AddView\CSHTML