diff --git a/application/ADBHausnummer/ADBHausnummerModel.php b/application/ADBHausnummer/ADBHausnummerModel.php
index 09eca9df8..d589558f7 100644
--- a/application/ADBHausnummer/ADBHausnummerModel.php
+++ b/application/ADBHausnummer/ADBHausnummerModel.php
@@ -189,6 +189,12 @@ class ADBHausnummerModel {
     }
 
 
+    /**
+     * @param $filter
+     * @param $limit
+     * @param $returnDBRessource
+     * @return ADBHausnummer[] ADBHausnummer Objects
+     */
     public static function search($filter, $limit = false, $returnDBRessource = false) {
         $items = [];
         $db = FronkDB::singleton(ADDRESSDB_DBHOST, ADDRESSDB_DBUSER, ADDRESSDB_DBPASS, ADDRESSDB_DBNAME);
diff --git a/application/ADBWohneinheit/ADBWohneinheit.php b/application/ADBWohneinheit/ADBWohneinheit.php
index cd9dd2959..349a674c5 100644
--- a/application/ADBWohneinheit/ADBWohneinheit.php
+++ b/application/ADBWohneinheit/ADBWohneinheit.php
@@ -50,6 +50,8 @@ class ADBWohneinheit extends mfBaseModel {
     if(!array_key_exists("no_updates", $_params) || !$_params['no_updates']) {
         // Statuschange from Rimo statuschange
         AddressDB::handleRimoStatusUpdate($this->id);
+        // Check if tuer has changed and sync to RIMO
+        $this->syncTuerToRimo();
     }
 
     $this->refreshUnitCount();
@@ -59,6 +61,59 @@ class ADBWohneinheit extends mfBaseModel {
     return true;
   }
 
+  private function syncTuerToRimo() {
+      // Check if tuer field has changed
+      $changes = $this->getChangedFields();
+      if(!in_array("tuer", $changes)) {
+          return true;
+      }
+
+      // Check if we have a RIMO external ID
+      if(!$this->extref) {
+          $this->log->debug("[".$this->_ruid."] ".__METHOD__.": No extref set, skipping RIMO sync");
+          return true;
+      }
+
+      // Get the hausnummer to access network owner
+      $hausnummer = $this->getProperty("hausnummer");
+      if(!$hausnummer || !$hausnummer->id) {
+          $this->log->debug("[".$this->_ruid."] ".__METHOD__.": No hausnummer found, skipping RIMO sync");
+          return true;
+      }
+
+      // Get RIMO API credentials
+      $creds = $hausnummer->getNetownerRimoApiCredentials();
+      if(!$creds) {
+          $this->log->warn("[".$this->_ruid."] ".__METHOD__.": No API credentials found for network owner");
+          return true;
+      }
+
+      // Get the API key (using prod environment)
+      $apikey = $creds["prod"]["key"];
+      if(!$apikey) {
+          $this->log->warn("[".$this->_ruid."] ".__METHOD__.": No API key found in credentials");
+          return true;
+      }
+
+      // Call RIMO API to update subAddress (tuer)
+      $this->log->info("[".$this->_ruid."] ".__METHOD__.": Syncing tuer change to RIMO for home ".$this->extref.": '".$this->tuer."'");
+
+      $subaddress = "";
+      if($this->tuer) {
+          $subaddress = "Top ".$this->tuer;
+      }
+
+      $result = Rimoapi::changeHomeSubAddress($apikey, $this->extref, $subaddress);
+
+      if($result) {
+          $this->log->info("[".$this->_ruid."] ".__METHOD__.": Successfully synced tuer to RIMO");
+      } else {
+          $this->log->error("[".$this->_ruid."] ".__METHOD__.": Failed to sync tuer to RIMO");
+      }
+
+      return $result;
+  }
+
   public function refreshUnitCount() {
       // ADBWohneinheit_onSave_noAutoUnitCount can be defined if doing bulk
       // operations where unit count is calculated seperately
diff --git a/application/Preorder/PreorderModel.php b/application/Preorder/PreorderModel.php
index adb334f6e..143cf91ea 100644
--- a/application/Preorder/PreorderModel.php
+++ b/application/Preorder/PreorderModel.php
@@ -482,6 +482,13 @@ class PreorderModel
         return self::count($filter);
     }
 
+    /**
+     * @param $filter
+     * @param $limit
+     * @param $returnDBRessource
+     * @param $returnArray
+     * @return Preorder[]
+     */
     public static function searchActive($filter = [], $limit = false, $returnDBRessource = false, $returnArray = false)
     {
         if (!is_array($filter)) return false;
diff --git a/lib/Rimoapi/Rimoapi.php b/lib/Rimoapi/Rimoapi.php
index e58de712a..f50c1fe2c 100644
--- a/lib/Rimoapi/Rimoapi.php
+++ b/lib/Rimoapi/Rimoapi.php
@@ -52,6 +52,45 @@ class Rimoapi {
         return true;
     }
 
+    public static function changeHomeSubAddress($apikey, $home_external_id, $subAddress) {
+        if(!$apikey) return false;
+        if(!$home_external_id) return false;
+
+        $log = mfLoghandler::singleton();
+
+        // send request to Rimo Api
+        $params = [];
+        $params['apiKey'] = $apikey;
+        $params['homeId'] = $home_external_id;
+        $params['subAddress'] = $subAddress;
+
+        $ctx_opts = [
+            'http' => [
+                'method' => 'PUT',
+                'header' => 'accept: application/json'
+            ]
+        ];
+
+        $qs = http_build_query($params);
+
+        $changeSubAddressEp = RIMO_API_JSON_URL.RIMO_API_JSON_EP_CHANGE_HOME_SUBADDRESS;
+        $put_url = $changeSubAddressEp."?".$qs;
+        $ctx = stream_context_create($ctx_opts);
+        $log->debug(__METHOD__.": SubAddress Change in Rimo: $put_url");
+        $response = file_get_contents($put_url, false, $ctx);
+        $log->debug(__METHOD__.": response: ".print_r($response,true));
+
+        if($response === false) {
+            $log->error("Fehler beim Update der SubAddress in RIMO ".$home_external_id);
+            return false;
+        }
+
+        $resp_data = json_decode($response);
+        if(!$resp_data->id) return false;
+
+        return true;
+    }
+
     public static function getFtuData($oaid, $home_external_id) {
         //$oaid = $oaid;
         $log = mfLoghandler::singleton();