diff --git a/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProject.cs b/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProject.cs
index 52ddafebe3..d6e623c4f1 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProject.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProject.cs
@@ -16,7 +16,7 @@ namespace Microsoft.AspNetCore.Razor.Language
             {
                 throw new ArgumentException(Resources.ArgumentCannotBeNullOrEmpty, nameof(root));
             }
-
+            
             Root = root.Replace('\\', '/').TrimEnd('/');
         }
 
@@ -36,16 +36,24 @@ namespace Microsoft.AspNetCore.Razor.Language
                 .EnumerateFiles("*.cshtml", SearchOption.AllDirectories)
                 .Select(file =>
                 {
-                    var relativePath = file.FullName.Substring(absoluteBasePath.Length).Replace(Path.DirectorySeparatorChar, '/');
-                    return new FileSystemRazorProjectItem(basePath, relativePath, file);
+                    var relativePhysicalPath = file.FullName.Substring(absoluteBasePath.Length + 1); // Include leading separator
+                    var filePath = "/" + relativePhysicalPath.Replace(Path.DirectorySeparatorChar, '/');
+
+                    return new FileSystemRazorProjectItem(basePath, filePath, relativePhysicalPath, file);
                 });
         }
 
         public override RazorProjectItem GetItem(string path)
         {
+            var absoluteBasePath = NormalizeAndEnsureValidPath("/");
             var absolutePath = NormalizeAndEnsureValidPath(path);
 
-            return new FileSystemRazorProjectItem("/", path, new FileInfo(absolutePath));
+            var file = new FileInfo(absolutePath);
+
+            var relativePhysicalPath = file.FullName.Substring(absoluteBasePath.Length + 1); // Include leading separator
+            var filePath = "/" + relativePhysicalPath.Replace(Path.DirectorySeparatorChar, '/');
+
+            return new FileSystemRazorProjectItem("/", filePath, relativePhysicalPath, new FileInfo(absolutePath));
         }
 
         protected override string NormalizeAndEnsureValidPath(string path)
diff --git a/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProjectItem.cs b/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProjectItem.cs
index 96a45027c8..210670d06a 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProjectItem.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/FileSystemRazorProjectItem.cs
@@ -11,12 +11,14 @@ namespace Microsoft.AspNetCore.Razor.Language
         /// Initializes a new instance of <see cref="FileSystemRazorProjectItem"/>.
         /// </summary>
         /// <param name="basePath">The base path.</param>
-        /// <param name="path">The path.</param>
+        /// <param name="relativePhysicalPath">The physical path of the base path.</param>
+        /// <param name="filePath">The path.</param>
         /// <param name="file">The <see cref="FileInfo"/>.</param>
-        public FileSystemRazorProjectItem(string basePath, string path, FileInfo file)
+        public FileSystemRazorProjectItem(string basePath, string filePath, string relativePhysicalPath, FileInfo file)
         {
             BasePath = basePath;
-            FilePath = path;
+            FilePath = filePath;
+            RelativePhysicalPath = relativePhysicalPath;
             File = file;
         }
 
@@ -30,6 +32,8 @@ namespace Microsoft.AspNetCore.Razor.Language
 
         public override string PhysicalPath => File.FullName;
 
+        public override string RelativePhysicalPath { get; }
+
         public override Stream Read() => new FileStream(PhysicalPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNetCore.Razor.Language/RazorProjectItem.cs b/src/Microsoft.AspNetCore.Razor.Language/RazorProjectItem.cs
index 67b0e04dfd..cadd00710c 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/RazorProjectItem.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/RazorProjectItem.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Diagnostics;
 using System.IO;
 
@@ -18,15 +19,23 @@ namespace Microsoft.AspNetCore.Razor.Language
         public abstract string BasePath { get; }
 
         /// <summary>
-        /// File path relative to <see cref="BasePath"/>.
+        /// File path relative to <see cref="BasePath"/>. This property uses the project path syntax,
+        /// using <c>/</c> as a path separator and does not follow the operating system's file system
+        /// conventions.
         /// </summary>
         public abstract string FilePath { get; }
 
         /// <summary>
-        /// The absolute path to the file, including the file name.
+        /// The absolute physical (file system) path to the file, including the file name.
         /// </summary>
         public abstract string PhysicalPath { get; }
 
+        /// <summary>
+        /// The relative physical (file system) path to the file, including the file name. Relative to the
+        /// physical path of the <see cref="BasePath"/>.
+        /// </summary>
+        public virtual string RelativePhysicalPath => null;
+
         /// <summary>
         /// Gets the file contents as readonly <see cref="Stream"/>.
         /// </summary>
diff --git a/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectItemTest.cs b/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectItemTest.cs
index 638d898e0d..a5193f45f9 100644
--- a/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectItemTest.cs
+++ b/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectItemTest.cs
@@ -20,14 +20,15 @@ namespace Microsoft.AspNetCore.Razor.Language
             var fileInfo = new FileInfo(Path.Combine(TestFolder, "Home.cshtml"));
 
             // Act
-            var projectItem = new FileSystemRazorProjectItem("/Views", "/Home.cshtml", fileInfo);
+            var projectItem = new FileSystemRazorProjectItem("/", "/Home.cshtml", "Home.cshtml", fileInfo);
 
             // Assert
             Assert.Equal("/Home.cshtml", projectItem.FilePath);
-            Assert.Equal("/Views", projectItem.BasePath);
+            Assert.Equal("/", projectItem.BasePath);
             Assert.True(projectItem.Exists);
             Assert.Equal("Home.cshtml", projectItem.FileName);
             Assert.Equal(fileInfo.FullName, projectItem.PhysicalPath);
+            Assert.Equal("Home.cshtml", projectItem.RelativePhysicalPath);
         }
 
         [Fact]
@@ -37,7 +38,7 @@ namespace Microsoft.AspNetCore.Razor.Language
             var fileInfo = new FileInfo(Path.Combine(TestFolder, "Views", "FileDoesNotExist.cshtml"));
 
             // Act
-            var projectItem = new FileSystemRazorProjectItem("/Views", "/FileDoesNotExist.cshtml", fileInfo);
+            var projectItem = new FileSystemRazorProjectItem("/Views", "/FileDoesNotExist.cshtml", Path.Combine("Views", "FileDoesNotExist.cshtml"), fileInfo);
 
             // Assert
             Assert.False(projectItem.Exists);
@@ -48,7 +49,7 @@ namespace Microsoft.AspNetCore.Razor.Language
         {
             // Arrange
             var fileInfo = new FileInfo(Path.Combine(TestFolder, "Home.cshtml"));
-            var projectItem = new FileSystemRazorProjectItem("/", "/Home.cshtml", fileInfo);
+            var projectItem = new FileSystemRazorProjectItem("/", "/Home.cshtml", "Home.cshtml", fileInfo);
 
             // Act
             var stream = projectItem.Read();
diff --git a/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectTest.cs b/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectTest.cs
index 98a22f4fc5..35f8b32117 100644
--- a/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectTest.cs
+++ b/test/Microsoft.AspNetCore.Razor.Language.Test/FileSystemRazorProjectTest.cs
@@ -73,24 +73,31 @@ namespace Microsoft.AspNetCore.Razor.Language
             var fileSystemProject = new FileSystemRazorProject(TestFolder);
 
             // Act
-            var files = fileSystemProject.EnumerateItems("/");
+            var items = fileSystemProject.EnumerateItems("/");
 
             // Assert
-            Assert.Collection(files.OrderBy(f => f.FilePath),
-                file =>
+            Assert.Collection(items.OrderBy(f => f.FilePath),
+                item =>
                 {
-                    Assert.Equal("/Home.cshtml", file.FilePath);
-                    Assert.Equal("/", file.BasePath);
+                    Assert.Equal("/Home.cshtml", item.FilePath);
+                    Assert.Equal("/", item.BasePath);
+                    Assert.Equal(Path.Combine(TestFolder, "Home.cshtml"), item.PhysicalPath);
+                    Assert.Equal("Home.cshtml", item.RelativePhysicalPath);
+
                 },
-                file =>
+                item =>
                 {
-                    Assert.Equal("/Views/About/About.cshtml", file.FilePath);
-                    Assert.Equal("/", file.BasePath);
+                    Assert.Equal("/Views/About/About.cshtml", item.FilePath);
+                    Assert.Equal("/", item.BasePath);
+                    Assert.Equal(Path.Combine(TestFolder, "Views", "About", "About.cshtml"), item.PhysicalPath);
+                    Assert.Equal(Path.Combine("Views", "About", "About.cshtml"), item.RelativePhysicalPath);
                 },
-                file =>
+                item =>
                 {
-                    Assert.Equal("/Views/Home/Index.cshtml", file.FilePath);
-                    Assert.Equal("/", file.BasePath);
+                    Assert.Equal("/Views/Home/Index.cshtml", item.FilePath);
+                    Assert.Equal("/", item.BasePath);
+                    Assert.Equal(Path.Combine(TestFolder, "Views", "Home", "Index.cshtml"), item.PhysicalPath);
+                    Assert.Equal(Path.Combine("Views", "Home", "Index.cshtml"), item.RelativePhysicalPath);
                 });
         }
 
@@ -101,19 +108,23 @@ namespace Microsoft.AspNetCore.Razor.Language
             var fileSystemProject = new FileSystemRazorProject(TestFolder);
 
             // Act
-            var files = fileSystemProject.EnumerateItems("/Views");
+            var items = fileSystemProject.EnumerateItems("/Views");
 
             // Assert
-            Assert.Collection(files.OrderBy(f => f.FilePath),
-                file =>
+            Assert.Collection(items.OrderBy(f => f.FilePath),
+                item =>
                 {
-                    Assert.Equal("/About/About.cshtml", file.FilePath);
-                    Assert.Equal("/Views", file.BasePath);
+                    Assert.Equal("/About/About.cshtml", item.FilePath);
+                    Assert.Equal("/Views", item.BasePath);
+                    Assert.Equal(Path.Combine(TestFolder, "Views", "About", "About.cshtml"), item.PhysicalPath);
+                    Assert.Equal(Path.Combine("About", "About.cshtml"), item.RelativePhysicalPath);
                 },
-                file =>
+                item =>
                 {
-                    Assert.Equal("/Home/Index.cshtml", file.FilePath);
-                    Assert.Equal("/Views", file.BasePath);
+                    Assert.Equal("/Home/Index.cshtml", item.FilePath);
+                    Assert.Equal("/Views", item.BasePath);
+                    Assert.Equal(Path.Combine(TestFolder, "Views", "Home", "Index.cshtml"), item.PhysicalPath);
+                    Assert.Equal(Path.Combine("Home", "Index.cshtml"), item.RelativePhysicalPath);
                 });
         }
 
@@ -124,25 +135,28 @@ namespace Microsoft.AspNetCore.Razor.Language
             var fileSystemProject = new FileSystemRazorProject(TestFolder);
 
             // Act
-            var files = fileSystemProject.EnumerateItems("/Does-Not-Exist");
+            var items = fileSystemProject.EnumerateItems("/Does-Not-Exist");
 
             // Assert
-            Assert.Empty(files);
+            Assert.Empty(items);
         }
 
         [Fact]
         public void GetItem_ReturnsFileFromDisk()
         {
             // Arrange
-            var path = "/Views/About/About.cshtml";
+            var filePath = "/Views/About/About.cshtml";
             var fileSystemProject = new FileSystemRazorProject(TestFolder);
 
             // Act
-            var file = fileSystemProject.GetItem(path);
+            var item = fileSystemProject.GetItem(filePath);
 
             // Assert
-            Assert.True(file.Exists);
-            Assert.Equal(path, file.FilePath);
+            Assert.True(item.Exists);
+            Assert.Equal(filePath, item.FilePath);
+            Assert.Equal("/", item.BasePath);
+            Assert.Equal(Path.Combine(TestFolder, "Views", "About", "About.cshtml"), item.PhysicalPath);
+            Assert.Equal(Path.Combine("Views", "About", "About.cshtml"), item.RelativePhysicalPath);
         }
 
         [Fact]
@@ -153,10 +167,10 @@ namespace Microsoft.AspNetCore.Razor.Language
             var fileSystemProject = new FileSystemRazorProject(TestFolder);
 
             // Act
-            var file = fileSystemProject.GetItem(path);
+            var item = fileSystemProject.GetItem(path);
 
             // Assert
-            Assert.False(file.Exists);
+            Assert.False(item.Exists);
         }
 
         private class TestFileSystemRazorProject : FileSystemRazorProject