diff --git a/BuildToolsVersion.txt b/BuildToolsVersion.txt
index f03b16e5589..62eb36fdf95 100644
--- a/BuildToolsVersion.txt
+++ b/BuildToolsVersion.txt
@@ -1 +1 @@
-1.0.26-prerelease-00625-01
+1.0.26-prerelease-00920-02
diff --git a/DotnetCLIVersion.txt b/DotnetCLIVersion.txt
index 637c64f4b15..6d7fdc186f6 100644
--- a/DotnetCLIVersion.txt
+++ b/DotnetCLIVersion.txt
@@ -1 +1 @@
-1.0.0-preview2-003121
\ No newline at end of file
+1.0.0-preview3-003886
\ No newline at end of file
diff --git a/build.cmd b/build.cmd
index d5c342d9bd6..6486e0a1e0f 100644
--- a/build.cmd
+++ b/build.cmd
@@ -49,7 +49,8 @@ goto :success
 rem disable setup build by setting FSC_BUILD_SETUP=0
 if /i '%FSC_BUILD_SETUP%' == '' (set FSC_BUILD_SETUP=1) 
 
-set BUILD_PROTO_WITH_CORECLR_LKG=0
+rem by default don't build coreclr lkg.  However allow configuration by setting an environment variable : set BUILD_PROTO_WITH_CORECLR_LKG = 1
+if '%BUILD_PROTO_WITH_CORECLR_LKG%' =='' (set BUILD_PROTO_WITH_CORECLR_LKG=0) 
 
 set BUILD_PROTO=0
 set BUILD_PHASE=1
diff --git a/init-tools.cmd b/init-tools.cmd
index 13d61e8ea4c..c0bf6707c91 100644
--- a/init-tools.cmd
+++ b/init-tools.cmd
@@ -1,4 +1,4 @@
-@if "%_echo%" neq "on" echo off
+@if not defined _echo @echo off
 setlocal
 
 set INIT_TOOLS_LOG=%~dp0init-tools.log
@@ -32,18 +32,18 @@ if NOT exist "%PROJECT_JSON_PATH%" mkdir "%PROJECT_JSON_PATH%"
 echo %PROJECT_JSON_CONTENTS% > "%PROJECT_JSON_FILE%"
 echo Running %0 > "%INIT_TOOLS_LOG%"
 
+set /p DOTNET_VERSION=< "%~dp0DotnetCLIVersion.txt"
 if exist "%DOTNET_CMD%" goto :afterdotnetrestore
 
 echo Installing dotnet cli...
 if NOT exist "%DOTNET_PATH%" mkdir "%DOTNET_PATH%"
-set /p DOTNET_VERSION=< "%~dp0DotnetCLIVersion.txt"
 set DOTNET_ZIP_NAME=dotnet-dev-win-x64.%DOTNET_VERSION%.zip
-set DOTNET_REMOTE_PATH=https://dotnetcli.blob.core.windows.net/dotnet/preview/Binaries/%DOTNET_VERSION%/%DOTNET_ZIP_NAME%
+set DOTNET_REMOTE_PATH=https://dotnetcli.blob.core.windows.net/dotnet/Sdk/%DOTNET_VERSION%/%DOTNET_ZIP_NAME%
 set DOTNET_LOCAL_PATH=%DOTNET_PATH%%DOTNET_ZIP_NAME%
 echo Installing '%DOTNET_REMOTE_PATH%' to '%DOTNET_LOCAL_PATH%' >> "%INIT_TOOLS_LOG%"
 powershell -NoProfile -ExecutionPolicy unrestricted -Command "$retryCount = 0; $success = $false; do { try { (New-Object Net.WebClient).DownloadFile('%DOTNET_REMOTE_PATH%', '%DOTNET_LOCAL_PATH%'); $success = $true; } catch { if ($retryCount -ge 6) { throw; } else { $retryCount++; Start-Sleep -Seconds (5 * $retryCount); } } } while ($success -eq $false); Add-Type -Assembly 'System.IO.Compression.FileSystem' -ErrorVariable AddTypeErrors; if ($AddTypeErrors.Count -eq 0) { [System.IO.Compression.ZipFile]::ExtractToDirectory('%DOTNET_LOCAL_PATH%', '%DOTNET_PATH%') } else { (New-Object -com shell.application).namespace('%DOTNET_PATH%').CopyHere((new-object -com shell.application).namespace('%DOTNET_LOCAL_PATH%').Items(),16) }" >> "%INIT_TOOLS_LOG%"
 if NOT exist "%DOTNET_LOCAL_PATH%" (
-  echo ERROR: Could not install dotnet cli correctly. See '%INIT_TOOLS_LOG%' for more details.
+  echo ERROR: Could not install dotnet cli correctly. See '%INIT_TOOLS_LOG%' for more details. 1>&2
   exit /b 1
 )
 
@@ -51,24 +51,33 @@ if NOT exist "%DOTNET_LOCAL_PATH%" (
 
 if exist "%BUILD_TOOLS_PATH%" goto :afterbuildtoolsrestore
 echo Restoring BuildTools version %BUILDTOOLS_VERSION%...
-echo Running: "%DOTNET_CMD%" restore "%PROJECT_JSON_FILE%" --packages %PACKAGES_DIR% --source "%BUILDTOOLS_SOURCE%" >> "%INIT_TOOLS_LOG%"
-call "%DOTNET_CMD%" restore "%PROJECT_JSON_FILE%" --packages %PACKAGES_DIR% --source "%BUILDTOOLS_SOURCE%" >> "%INIT_TOOLS_LOG%"
+echo Running: "%DOTNET_CMD%" restore "%PROJECT_JSON_FILE%" --no-cache --packages %PACKAGES_DIR% --source "%BUILDTOOLS_SOURCE%" >> "%INIT_TOOLS_LOG%"
+call "%DOTNET_CMD%" restore "%PROJECT_JSON_FILE%" --no-cache --packages %PACKAGES_DIR% --source "%BUILDTOOLS_SOURCE%" >> "%INIT_TOOLS_LOG%"
 if NOT exist "%BUILD_TOOLS_PATH%init-tools.cmd" (
-  echo ERROR: Could not restore build tools correctly. See '%INIT_TOOLS_LOG%' for more details.
+  echo ERROR: Could not restore build tools correctly. See '%INIT_TOOLS_LOG%' for more details. 1>&2
   exit /b 1
 )
 
 :afterbuildtoolsrestore
 
-echo Initializing BuildTools ...
+echo Initializing BuildTools...
 echo Running: "%BUILD_TOOLS_PATH%init-tools.cmd" "%~dp0" "%DOTNET_CMD%" "%TOOLRUNTIME_DIR%" >> "%INIT_TOOLS_LOG%"
 call "%BUILD_TOOLS_PATH%init-tools.cmd" "%~dp0" "%DOTNET_CMD%" "%TOOLRUNTIME_DIR%" >> "%INIT_TOOLS_LOG%"
 set INIT_TOOLS_ERRORLEVEL=%ERRORLEVEL%
 if not [%INIT_TOOLS_ERRORLEVEL%]==[0] (
-	echo ERROR: An error occured when trying to initialize the tools. Please check '%INIT_TOOLS_LOG%' for more details.
-	exit /b %INIT_TOOLS_ERRORLEVEL%
+  echo ERROR: An error occured when trying to initialize the tools. Please check '%INIT_TOOLS_LOG%' for more details. 1>&2
+  exit /b %INIT_TOOLS_ERRORLEVEL%
+)
+
+echo Updating CLI NuGet Frameworks map...
+robocopy "%TOOLRUNTIME_DIR%" "%TOOLRUNTIME_DIR%\dotnetcli\sdk\%DOTNET_VERSION%" NuGet.Frameworks.dll /XO >> "%INIT_TOOLS_LOG%"
+set UPDATE_CLI_ERRORLEVEL=%ERRORLEVEL%
+if %UPDATE_CLI_ERRORLEVEL% GTR 1 (
+  echo ERROR: Failed to update Nuget for CLI {Error level %UPDATE_CLI_ERRORLEVEL%}. Please check '%INIT_TOOLS_LOG%' for more details. 1>&2
+  exit /b %UPDATE_CLI_ERRORLEVEL%
 )
 
 :: Create sempahore file
 echo Done initializing tools.
-echo Init-Tools.cmd completed for BuildTools Version: %BUILDTOOLS_VERSION% > "%BUILD_TOOLS_SEMAPHORE%"
\ No newline at end of file
+echo Init-Tools.cmd completed for BuildTools Version: %BUILDTOOLS_VERSION% > "%BUILD_TOOLS_SEMAPHORE%"
+exit /b 0
diff --git a/src/FSharpSource.Settings.targets b/src/FSharpSource.Settings.targets
index 25d86b970b8..196c04efb52 100644
--- a/src/FSharpSource.Settings.targets
+++ b/src/FSharpSource.Settings.targets
@@ -1,6 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+  <!-- If Configuration is empty that means we are not being built in VS and so folks need to explicitly pass the different
+      values for $(ConfigurationGroup), $(TargetGroup), or $(OSGroup) or accept the defaults for them.
+  -->
+  <PropertyGroup Condition="'$(Configuration)'==''">
+    <ConfigurationGroup Condition="'$(ConfigurationGroup)'==''">Debug</ConfigurationGroup>
+    <Configuration>$(ConfigurationGroup)</Configuration>
+    <Configuration Condition="'$(TargetGroup)'!=''">$(TargetGroup)_$(Configuration)</Configuration>
+    <Configuration Condition="'$(OSGroup)'!='' and '$(OSGroup)'!='AnyOS'">$(OSGroup)_$(Configuration)</Configuration>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)'!=''">
+    <ConfigurationGroup Condition="'$(ConfigurationGroup)'=='' and $(Configuration.ToLower().EndsWith('debug'))">Debug</ConfigurationGroup>
+    <ConfigurationGroup Condition="'$(ConfigurationGroup)'=='' and $(Configuration.ToLower().EndsWith('release'))">Release</ConfigurationGroup>
+    <ConfigurationGroup Condition="'$(ConfigurationGroup)'==''">Debug</ConfigurationGroup>
+  </PropertyGroup>
+
   <PropertyGroup>
     <!-- Tail calls on, even in debug -->
     <Tailcalls>true</Tailcalls>
diff --git a/src/fsharp/FSharp.Compiler.Unittests/FSharp.Compiler.Unittests.fsproj b/src/fsharp/FSharp.Compiler.Unittests/FSharp.Compiler.Unittests.fsproj
index 20f9c1fbbc0..e0956d6f26a 100644
--- a/src/fsharp/FSharp.Compiler.Unittests/FSharp.Compiler.Unittests.fsproj
+++ b/src/fsharp/FSharp.Compiler.Unittests/FSharp.Compiler.Unittests.fsproj
@@ -7,7 +7,6 @@
   </PropertyGroup>
   <Import Project="$(FSharpSourcesRoot)\FSharpSource.Settings.targets" />
   <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <SchemaVersion>2.0</SchemaVersion>
     <AllowCrossTargeting>true</AllowCrossTargeting>
diff --git a/src/fsharp/FSharp.Core/FSharp.Core.fsproj b/src/fsharp/FSharp.Core/FSharp.Core.fsproj
index c48c1df40df..653358df643 100644
--- a/src/fsharp/FSharp.Core/FSharp.Core.fsproj
+++ b/src/fsharp/FSharp.Core/FSharp.Core.fsproj
@@ -3,7 +3,6 @@
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <FSharpSourcesRoot>..\..</FSharpSourcesRoot>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
   </PropertyGroup>
   <Import Project="$(FSharpSourcesRoot)\FSharpSource.Settings.targets" />
   <PropertyGroup>