diff --git a/contrib/buildbot/server.py b/contrib/buildbot/server.py
--- a/contrib/buildbot/server.py
+++ b/contrib/buildbot/server.py
@@ -362,14 +362,28 @@
         staging_ref = phab.get_latest_diff_staging_ref(revision_PHID)
         # Trigger the requested builds
         for build in builds:
+            properties = [{
+                'name': 'env.ABC_BUILD_NAME',
+                'value': build,
+            }]
+
+            # Temporary agent pool override until we've completely migrated
+            # away from the lower memory build agents.
+            if build == 'build-tsan':
+                properties.append({
+                    'agent': {
+                        'pool': {
+                            # ABC Build Agent pool
+                            'id': 1,
+                        },
+                    },
+                })
+
             # FIXME the hardcoded infos here should be gathered from somewhere
             tc.trigger_build(
                 "BitcoinABC_BitcoinAbcStaging",
                 staging_ref,
-                properties=[{
-                    'name': 'env.ABC_BUILD_NAME',
-                    'value': build,
-                }]
+                properties=properties,
             )
 
         # If we reach this point, trigger_build did not raise an exception.
diff --git a/contrib/buildbot/test/test_endpoint_triggerCI.py b/contrib/buildbot/test/test_endpoint_triggerCI.py
--- a/contrib/buildbot/test/test_endpoint_triggerCI.py
+++ b/contrib/buildbot/test/test_endpoint_triggerCI.py
@@ -320,6 +320,42 @@
             ]
         )
 
+    def test_triggerCI_explicit_agent_pool(self):
+        def assert_teamcity_queued_builds(comments, queued_builds):
+            self.set_transaction_return_value(comments)
+            response = self.call_endpoint()
+            expected_calls = [
+                call(
+                    "BitcoinABC_BitcoinAbcStaging",
+                    "refs/tags/phabricator/diff/{}".format(self.diff_id),
+                    properties=[{
+                        'name': 'env.ABC_BUILD_NAME',
+                        'value': build_id,
+                    }, {
+                        'agent': {
+                            'pool': {
+                                'id': 1,
+                            },
+                        },
+                    }]
+                )
+                for build_id in queued_builds
+            ]
+            print(expected_calls)
+            self.teamcity.trigger_build.assert_has_calls(
+                expected_calls, any_order=True)
+            self.assertEqual(response.status_code, 200)
+
+        # build-tsan should explicitly set the agent build pool
+        assert_teamcity_queued_builds(
+            [
+                "@bot build-tsan",
+            ],
+            [
+                "build-tsan",
+            ]
+        )
+
 
 if __name__ == '__main__':
     unittest.main()