diff --git a/.gitignore b/.gitignore
index a4c7c89ff4..fb3a29176c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,6 @@ GeneratedAssemblyInfo.cs
 Collection.cpp
 .vs/
 Build/GlobalInclude.properties
-Build/LibraryDevelopment.properties
 Build/NuGet.exe
 Build/nunit.framework.dll
 Build/nunit.framework.xml
diff --git a/Build/DownloadLibraryDependencies.pl b/Build/DownloadLibraryDependencies.pl
deleted file mode 100644
index 344d423f7f..0000000000
--- a/Build/DownloadLibraryDependencies.pl
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/usr/bin/perl
-
-# This script is used to download the dependencies to build libpalaso, liblcm and chorus
-# libraries locally for debugging FLEx. It find the locations to these local repos by parsing
-# the LibraryDevelopment.properties file.
-
-# Run: perl DownloadLibraryDependencies.pl
-# Note: you will need to install XML::Simple to run this script.
-# XML::Simple is included in Strawberry Perl on windows (http://strawberryperl.com/)
-# XML::Simple installation can be done on linux using the CPAN shell:
-#   shell> perl -MCPAN -e shell
-#   cpan> install XML::Simple
-
-# After this script terminates, do the following to build libraries locally
-#   Windows: build /t:LocalLibrary /p:Platform=<x86|x64>
-#   Linux: msbuild /t:LocalLibrary
-use XML::Simple;
-
-my $osName = "$^O";
-my $extension = "win.sh";
-if ($osName eq "linux") {
-	$extension = "mono.sh";
-}
-my $xml = new XML::Simple;
-my $data = $xml->XMLin("LibraryDevelopment.properties");
-my $palasoArtifactsDir = "$data->{PropertyGroup}->{'PalasoArtifactsDir'}->{content}";
-my $chorusArtifactsDir = "$data->{PropertyGroup}->{'ChorusArtifactsDir'}->{content}";
-my $useLocal = "$data->{PropertyGroup}->{'UseLocalLibraries'}";
-print "Downloading libpalaso dependencies...\n";
-
-# Look for "output" in the path and take everything before it
-if (not $palasoArtifactsDir =~ m/output/) {
-	die "Error: Expected to find 'output' in the libpalaso artifacts path. Check the LibraryDevelopment.properties file.\n";
-}
-my $palasoBase = "$`";
-# Replace backslashes with forward slashes
-$palasoBase =~ s/\\/\//g;
-system($palasoBase . "build/buildupdate.$extension");
-print "Finished downloading libpalaso dependencies.\n";
-print "Downloading chorus dependencies...\n";
-if (not $chorusArtifactsDir =~ m/output/) {
-	die "Error: Expected to find 'output' in the chorus artifacts path. Check the LibraryDevelopment.properties file.\n";
-}
-my $chorusBase = "$`";
-$chorusBase =~ s/\\/\//g;
-system($chorusBase . "build/buildupdate.$extension");
-print "Finished downloading chorus dependencies.\n";
-if ($useLocal ne "Y") {
-	print "\nWARNING: FieldWorks is not set to build using local libraries. Edit the LibraryDevelopment.properties file to change this.\n";
-}
\ No newline at end of file
diff --git a/Build/InstallerBuild.proj b/Build/InstallerBuild.proj
index 2ae3e091bc..d7df9bb384 100644
--- a/Build/InstallerBuild.proj
+++ b/Build/InstallerBuild.proj
@@ -28,7 +28,6 @@
   <Import Project="$(MSBuildThisFileDirectory)RegFree.targets"/>
   <Import Project="$(MSBuildThisFileDirectory)Installer.Wix3.targets" Condition="'$(OS)'=='Windows_NT' and '$(InstallerToolset)'=='Wix3'"/>
   <Import Project="$(MSBuildThisFileDirectory)Installer.targets" Condition="'$(OS)'=='Windows_NT' and '$(InstallerToolset)'=='Wix6'"/>
-  <Import Project="$(MSBuildThisFileDirectory)LocalLibrary.targets"/>
 
   <!-- BuildInstaller target is imported from Installer.Wix3.targets or Installer.targets (Wix6) -->
 
diff --git a/Build/LibraryDevelopment.targets b/Build/LibraryDevelopment.targets
deleted file mode 100644
index a694d238dd..0000000000
--- a/Build/LibraryDevelopment.targets
+++ /dev/null
@@ -1,57 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="Current">
-	<Import Project="LibraryDevelopment.properties" Condition="Exists('LibraryDevelopment.properties')"/>
-	<Target Name="UpdateDevelopmentPropertiesFile">
-		<PropertyGroup>
-			<!-- Upgrade legacy value -->
-			<LcmArtifactsDir Condition="'$(LcmArtifactsDir)'=='' AND '$(LcmLocalArtifactsDir)'!=''">$(LcmLocalArtifactsDir)</LcmArtifactsDir>
-			<LcmRootDir Condition="'$(LcmRootDir)'=='' AND '$(LcmLocalArtifactsDir)'!=''">$([System.IO.Path]::GetFullPath(&quot;$(LcmLocalArtifactsDir)/../..&quot;))</LcmRootDir>
-			<!-- Fallback value -->
-			<LcmRootDir Condition="'$(LcmRootDir)'==''">UNSPECIFIED</LcmRootDir>
-		</PropertyGroup>
-		<!-- Yellow text to catch the user's attention -->
-		<Warning Text="To build localizations (and installers, which depend on them), github.com/sillsdev/liblcm must be cloned locally to '$(LcmRootDir)' (you can change this)"/>
-		<MSBuild.ExtensionPack.UI.Console TaskAction="ReadLine" UserPrompt="Do you plan to build localizations? (y/N)" ToUpper="true"
-			Condition="!Exists('LibraryDevelopment.properties')">
-			<Output TaskParameter="UserResponse" PropertyName="NeedLocalLCM"/>
-		</MSBuild.ExtensionPack.UI.Console>
-		<MSBuild.ExtensionPack.UI.Console TaskAction="ReadLine" UserPrompt="What is the liblcm root path?" Condition="'$(NeedLocalLCM)'=='Y'">
-			<Output TaskParameter="UserResponse" PropertyName="LcmRootDir"/>
-		</MSBuild.ExtensionPack.UI.Console>
-		<MSBuild Projects="$(MSBuildProjectFullPath)" Targets="WriteDevelopmentPropertiesFile" Properties="LcmRootDir=$(LcmRootDir);LcmArtifactsDir=$(LcmArtifactsDir)"/>
-	</Target>
-	<Target Name="WriteDevelopmentPropertiesFile">
-		<!-- Using .temp file since it seemed xbuild was sometimes loading the .properties file while it was being composed. -->
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Overwrite="true" Lines="&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;!-- This file is generated by the (Update|Write)DevelopmentPropertiesFile task, but it is safe to hand edit. --&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;Project xmlns=&quot;http://schemas.microsoft.com/developer/msbuild/2003&quot; ToolsVersion=&quot;Current&quot;&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;PropertyGroup&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;UseLocalLibraries&gt;$(UseLocalLibraries)&lt;/UseLocalLibraries&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;PalasoArtifactsDir Condition=&quot;'%24(UseLocalLibraries)'=='Y'&quot;&gt;$(PalasoArtifactsDir)&lt;/PalasoArtifactsDir&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;ChorusArtifactsDir Condition=&quot;'%24(UseLocalLibraries)'=='Y'&quot;&gt;$(ChorusArtifactsDir)&lt;/ChorusArtifactsDir&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;!-- For localization, we always need to have access to the full LCM repository. --&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;LcmRootDir&gt;$(LcmRootDir)&lt;/LcmRootDir&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;LcmArtifactsDir Condition=&quot;'%24(UseLocalLibraries)'=='Y'&quot;&gt;$(LcmArtifactsDir)&lt;/LcmArtifactsDir&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;/PropertyGroup&gt;" />
-		<WriteLinesToFile File="LibraryDevelopment.properties.temp" Lines="&lt;/Project&gt;" />
-		<!-- Copy and Delete is easier than Move in mono4 xbuild. -->
-		<Copy SourceFiles="LibraryDevelopment.properties.temp" DestinationFiles="LibraryDevelopment.properties" />
-		<Delete Files="LibraryDevelopment.properties.temp" />
-		</Target>
-
-	<Target Name="WriteNonlocalDevelopmentPropertiesFile">
-		<Message Text="Writing to LibraryDevelopment.properties, to not use local libraries."/>
-		<CallTarget Targets="SetUseLocalLibrariesNo" />
-		<CallTarget Targets="WriteDevelopmentPropertiesFile" />
-	</Target>
-
-	<Target Name="SetUseLocalLibrariesNo">
-		<PropertyGroup>
-			<UseLocalLibraries>N</UseLocalLibraries>
-		</PropertyGroup>
-	</Target>
-
-	<Target Name="CheckDevelopmentPropertiesFile">
-		<CallTarget Targets="UpdateDevelopmentPropertiesFile" Condition="'$(LcmRootDir)' == ''" />
-	</Target>
-</Project>
\ No newline at end of file
diff --git a/Build/LocalLibrary.targets b/Build/LocalLibrary.targets
deleted file mode 100644
index 033673b619..0000000000
--- a/Build/LocalLibrary.targets
+++ /dev/null
@@ -1,68 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="Current">
-	<!-- x64-only build on Windows (x86 is no longer supported) -->
-	<PropertyGroup>
-		<LiblcmPlatform Condition="'$(OS)'=='Windows_NT'">x64</LiblcmPlatform>
-		<LiblcmPlatform Condition="'$(OS)'!='Windows_NT'">x86</LiblcmPlatform>
-		<ChorusPlatform>Any CPU</ChorusPlatform>
-		<ConfigName Condition="'$(OS)'=='Windows_NT'">Debug</ConfigName>
-		<ConfigName Condition="'$(OS)'!='Windows_NT'">DebugMono</ConfigName>
-	</PropertyGroup>
-	<ItemGroup>
-		<!--Files needed from the Palaso library to build liblcm and chorus-->
-		<PalasoFileNamesForLL Include="SIL.Core.dll" />
-		<PalasoFileNamesForLL Include="SIL.Core.pdb" />
-		<PalasoFileNamesForLL Include="SIL.Core.Desktop.dll" />
-		<PalasoFileNamesForLL Include="SIL.Core.Desktop.pdb" />
-		<PalasoFileNamesForLL Include="SIL.Lexicon.dll" />
-		<PalasoFileNamesForLL Include="SIL.Lexicon.pdb" />
-		<PalasoFileNamesForLL Include="SIL.WritingSystems.dll" />
-		<PalasoFileNamesForLL Include="SIL.WritingSystems.pdb" />
-		<PalasoFileNamesForLL Include="SIL.TestUtilities.dll" />
-		<PalasoFileNamesForLL Include="Newtonsoft.Json.dll" /> <!-- REVIEW (Hasso) 2021.12: include here or directly from its own package? -->
-		<PalasoFileNamesForLL Include="Spart.dll" />
-		<!--The Chorus Library uses these-->
-		<ChorusDeps Include="SIL.Windows.Forms.dll" />
-		<ChorusDeps Include="SIL.Windows.Forms.pdb" />
-		<ChorusDeps Include="SIL.Windows.Forms.GeckoBrowserAdapter.dll" />
-		<ChorusDeps Include="SIL.Windows.Forms.GeckoBrowserAdapter.pdb" />
-		<ChorusDeps Include="SIL.Lift.dll" />
-		<ChorusDeps Include="SIL.Lift.pdb" />
-		<ChorusDeps Include="SIL.WritingSystems.Tests.dll" />
-		<ChorusDeps Include="SIL.WritingSystems.Tests.pdb" />
-	</ItemGroup>
-	<Target Name="LocalLibrary">
-		<!--Build the Palaso library-->
-		<MakeDir Directories="$(PalasoArtifactsDir)" />
-		<Message Text="Building libpalaso. Artifacts will be put into: $(PalasoArtifactsDir)" />
-		<MSBuild Projects="$(PalasoArtifactsDir)/../../build/Palaso.proj"
-			Targets="RestorePackages"
-			Properties="Configuration=$(ConfigName);Platform=$(LibpalasoPlatform)"
-			ToolsVersion="Current" />
-		<MSBuild Projects="$(PalasoArtifactsDir)/../../build/Palaso.proj"
-			Targets="Build"
-			Properties="Configuration=$(ConfigName);Platform=$(Platform)"/>
-		<!--Build the LCM library-->
-		<MakeDir Directories="$(LcmArtifactsDir)" />
-		<MakeDir Directories="$(LcmRootDir)/lib/downloads/$(Platform)" Condition="'$(OS)'=='Windows_NT' "/>
-		<Copy SourceFiles="@(PalasoFileNamesForLL -> '$(PalasoArtifactsDir)/%(Identity)')" DestinationFolder="$(LcmRootDir)/lib/downloads" />
-		<Message Text="Building liblcm. Artifacts will be put into: $(LcmArtifactsDir)" />
-		<MSBuild Projects="$(LcmRootDir)/LCM.sln"
-			Targets="Rebuild"
-			Properties="Configuration=Debug;Platform=$(LiblcmPlatform);UseLocalFiles=True"
-			ToolsVersion="Current" Condition="'$(OS)'=='Windows_NT'" />
-		<Exec Command="$(LcmRootDir)/build.sh Debug Rebuild True" Condition="'$(OS)'!='Windows_NT'"/>
-		<!--Build the Chorus library-->
-		<MakeDir Directories="$(ChorusArtifactsDir)" />
-		<Copy SourceFiles="@(PalasoFileNamesForLL -> '$(PalasoArtifactsDir)/%(Identity)')" DestinationFolder="$(ChorusArtifactsDir)/../../lib/$(ConfigName)" />
-		<Copy SourceFiles="@(ChorusDeps -> '$(PalasoArtifactsDir)/%(Identity)')" DestinationFolder="$(ChorusArtifactsDir)/../../lib/$(ConfigName)" />
-		<Message Text="Building chorus. Artifacts will be put into: $(ChorusArtifactsDir)" />
-		<MSBuild Projects="$(ChorusArtifactsDir)/../../build/Chorus.proj"
-			Targets="RestorePackages"
-			Properties="Configuration=$(ConfigName);Platform=$(ChorusPlatform)"
-			ToolsVersion="Current" />
-		<MSBuild Projects="$(ChorusArtifactsDir)/../../build/Chorus.proj"
-			Targets="Compile"
-			Properties="Configuration=$(ConfigName);Platform=$(ChorusPlatform)"/>
-	</Target>
-</Project>
\ No newline at end of file
diff --git a/Build/Localize.targets b/Build/Localize.targets
index d4e29dab4d..2682152a50 100644
--- a/Build/Localize.targets
+++ b/Build/Localize.targets
@@ -105,8 +105,8 @@
 	<Target Name="VerifyLcmCloned">
 		<Error
 			Text="LcmSrcDir '$(LcmSrcDir)' was not found.
-To update localizations, liblcm must be cloned locally to the location specified by %24LcmRootDir
-(historically set in $(MSBuildThisFileDirectory)LibraryDevelopment.properties; now an environment variable)."
+To update localizations, liblcm must be cloned locally to the location specified by the
+%24LcmRootDir environment variable."
 			Condition="!Exists('$(LcmSrcDir)')"
 		/>
 	</Target>
diff --git a/Build/PackageRestore.targets b/Build/PackageRestore.targets
index e58d0f0448..0f70e2ac64 100644
--- a/Build/PackageRestore.targets
+++ b/Build/PackageRestore.targets
@@ -250,7 +250,6 @@
 		<ItemGroup>
 			<SILNugetFiles Include="$(PackagesDir)/$([System.String]::new('%(SILNugetPackages.Identity)').ToLower())/%(SILNugetPackages.Version)/%(SILNugetPackages.Path)" />
 		</ItemGroup>
-		<!-- TODO (Hasso) 2011.11: copy on Condition="'$(UseLocalLibraries)'!='Y'" -->
 		<Message Text="Copying artifacts from Palaso, Chorus, LCM, and related packages to Downloads." />
 		<Copy
 			SourceFiles="@(SILNugetFiles)"
@@ -258,10 +257,6 @@
 			SkipUnchangedFiles="true"
 			OverwriteReadOnlyFiles="true"
 		/>
-		<Message
-			Text="(Palaso, Chorus, and LCM artifacts will be copied to Output from $(PalasoArtifactsDir), $(ChorusArtifactsDir), and $(LcmArtifactsDir), respectively, as  specified in LibraryDevelopment.targets)"
-			Condition="'$(UseLocalLibraries)'=='Y'"
-		/>
 		<!-- ExCss.dll is now provided by the SIL.ExCSS NuGet package (no TeamCity download needed). -->
 		<!-- GeckofxHtmlToPdf binaries downloaded from GitHub release (replaces decommissioned TeamCity server). -->
 		<DownloadFile
diff --git a/openspec/specs/architecture/build-deploy/build-phases.md b/openspec/specs/architecture/build-deploy/build-phases.md
index 5e11d1062d..7f60b9026d 100644
--- a/openspec/specs/architecture/build-deploy/build-phases.md
+++ b/openspec/specs/architecture/build-deploy/build-phases.md
@@ -64,7 +64,6 @@ Also hosts `BuildWindowsXslAssemblies` (invoked by `Directory.Build.targets` for
 | `Build/FwBuildTasks.targets` | UsingTask declarations for custom MSBuild tasks (Make, RegFree, etc.) | InstallerBuild.proj, NativeBuild.csproj |
 | `Build/RegFree.targets` | Registration-free COM manifest generation | InstallerBuild.proj, NativeBuild.csproj |
 | `Build/Localize.targets` | Crowdin localization integration | InstallerBuild.proj, NativeBuild.csproj |
-| `Build/LocalLibrary.targets` | Local Palaso/LCM/Chorus development overrides | InstallerBuild.proj |
 | `Build/SilVersions.props` | SIL ecosystem version numbers (shared with Directory.Packages.props) | PackageRestore.targets |
 | `Build/Installer.Wix3.targets` | WiX 3 installer entry point | InstallerBuild.proj |
 | `Build/Installer.targets` | WiX 6 installer pipeline | InstallerBuild.proj |