diff --git a/planetstack/model_policies/__init__.py b/planetstack/model_policies/__init__.py
index 8671d6a..ac395a1 100644
--- a/planetstack/model_policies/__init__.py
+++ b/planetstack/model_policies/__init__.py
@@ -1,3 +1,4 @@
 from .model_policy_Slice import *
 from .model_policy_User import *
 from .model_policy_Network import *
+from .model_policy_Site import *
diff --git a/planetstack/model_policies/model_policy_Site.py b/planetstack/model_policies/model_policy_Site.py
new file mode 100644
index 0000000..cfadbd4
--- /dev/null
+++ b/planetstack/model_policies/model_policy_Site.py
@@ -0,0 +1,27 @@
+from core.models import *
+
+def handle(site):
+    """ 
+    ensure ControllerSiteDeployment object exists for each of the site's SiteDeployment objects
+    """
+    from core.models import SiteDeployments, Controller, ControllerSiteDeployments 
+    from collections import defaultdict
+    
+    
+    # get current controller site deployments	
+    ctrl_site_deployments = ControllerSiteDeployments.objects.filter(site_deployment__site = site)
+    ctrl_site_deployments_dict = {} 
+    for ctrl_site_depl in controller_site_deployments:
+        ctrl_site_deployments_dict[ctrl_site_depl.site_deployment] = ctrl_cite_depl
+
+    # get current site deployments
+    site_deployments = SiteDeployments.objects.filter(site=site)
+ 
+    # for each site deployment, if there is no controller site deployment create one 
+    for site_deployment in site_deployments:
+        if site_deployment not in ctrl_site_deployments_dict:
+            ctrl_site_deployment = ControllerSiteDeployment(
+                site_deployment=site_deployment,
+                controller=site_deployment.controller,
+            )
+            ctrl_site_deployment.save()