diff --git a/etl/mark_demolitions.sh b/etl/mark_demolitions.sh
new file mode 100644
index 00000000..74ebe28d
--- /dev/null
+++ b/etl/mark_demolitions.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+psql -c "DROP TABLE IF EXISTS old_geometries;"
+
+echo "Creating temporary table for geometries in the db not present in new data..."
+psql -c "CREATE TABLE IF NOT EXISTS old_geometries (
+    source_id varchar(30) PRIMARY KEY,
+    geometry_geom geometry(GEOMETRY, 3857)
+);"
+
+echo "Find geometries in the db not present in new data..."
+psql -c "INSERT INTO old_geometries ( source_id, geometry_geom )
+         SELECT source_id, geometry_geom
+         FROM geometries AS g
+         WHERE NOT EXISTS ( SELECT source_id
+                            FROM release_geometries AS r
+                            WHERE g.source_id = r.source_id);"
+                            
+echo "Set each building's latest_demolish_date for today if linked geometry in the db not present in new data..."
+psql -c "UPDATE buildings AS b
+         SET latest_demolish_date = CURRENT_DATE
+         WHERE b.source_id = g.source_id
+            AND source_id IN (SELECT source_id
+                              FROM old_geometries AS g
+                              );"
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