diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index 824b0efff..755615e8b 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -416,6 +416,8 @@ private
         self["ecstat#{idx}"] = nil
       end
     end
+    self.landlord = 1 if owning_organisation.provider_type == "LA"
+    self.landlord = 2 if owning_organisation.provider_type == "PRP"
   end
 
   def process_postcode_changes!
diff --git a/spec/fixtures/complete_case_log.json b/spec/fixtures/complete_case_log.json
index dcfa683d0..2089965a1 100644
--- a/spec/fixtures/complete_case_log.json
+++ b/spec/fixtures/complete_case_log.json
@@ -53,7 +53,7 @@
     "startertenancy": 0,
     "tenancylength": 5,
     "tenancy": 3,
-    "landlord": "This landlord",
+    "landlord": 1,
     "la": "Barnet",
     "postcode_full": "NW1 5TY",
     "property_relet": 0,
diff --git a/spec/models/case_log_spec.rb b/spec/models/case_log_spec.rb
index 5777f4306..f69536cb3 100644
--- a/spec/models/case_log_spec.rb
+++ b/spec/models/case_log_spec.rb
@@ -258,6 +258,24 @@ RSpec.describe CaseLog do
       expect(record_from_db["renttype"]).to eq(3)
     end
 
+    context "when the owning organisation is a PRP" do
+      it "correctly derives and saves landlord based on owning_organisation provider_type" do
+        record_from_db = ActiveRecord::Base.connection.execute("select landlord from case_logs where id=#{case_log.id}").to_a[0]
+        expect(case_log.landlord).to eq(2)
+        expect(record_from_db["landlord"]).to eq(2)
+      end
+    end
+
+    context "when the owning organisation is an LA" do
+      let(:organisation) { FactoryBot.create(:organisation) }
+
+      it "correctly derives and saves landlord based on owning_organisation provider_type" do
+        record_from_db = ActiveRecord::Base.connection.execute("select landlord from case_logs where id=#{case_log.id}").to_a[0]
+        expect(case_log.landlord).to eq(1)
+        expect(record_from_db["landlord"]).to eq(1)
+      end
+    end
+
     context "when deriving lettype" do
       context "when the owning organisation is a PRP" do
         context "when the rent type is intermediate rent and supported housing" do