diff --git a/fern/apis/fdr/definition/api/v1/read/type.yml b/fern/apis/fdr/definition/api/v1/read/type.yml
index 7cac35b1f8..1876c3f680 100644
--- a/fern/apis/fdr/definition/api/v1/read/type.yml
+++ b/fern/apis/fdr/definition/api/v1/read/type.yml
@@ -45,6 +45,7 @@ types:
     properties:
       extends: list<rootCommons.TypeId>
       properties: list<ObjectProperty>
+      extraProperties: optional<TypeReference>
 
   ObjectProperty:
     extends:
diff --git a/fern/apis/fdr/definition/api/v1/register/type.yml b/fern/apis/fdr/definition/api/v1/register/type.yml
index e178fc86f0..d4894fceaf 100644
--- a/fern/apis/fdr/definition/api/v1/register/type.yml
+++ b/fern/apis/fdr/definition/api/v1/register/type.yml
@@ -45,6 +45,7 @@ types:
     properties:
       extends: list<rootCommons.TypeId>
       properties: list<ObjectProperty>
+      extraProperties: optional<TypeReference>
 
   ObjectProperty:
     extends:
diff --git a/packages/fdr-sdk/src/api-definition/migrators/v1ToV2.ts b/packages/fdr-sdk/src/api-definition/migrators/v1ToV2.ts
index 0476fd7853..540ed757d1 100644
--- a/packages/fdr-sdk/src/api-definition/migrators/v1ToV2.ts
+++ b/packages/fdr-sdk/src/api-definition/migrators/v1ToV2.ts
@@ -280,7 +280,8 @@ export class ApiDefinitionV1ToLatest {
                 type: "object",
                 extends: value.extends,
                 properties: this.migrateObjectProperties(value.properties),
-                extraProperties: undefined,
+                extraProperties:
+                    value.extraProperties != null ? this.migrateTypeReference(value.extraProperties) : undefined,
             }),
             alias: (value) => ({
                 type: "alias",
diff --git a/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.ts b/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.ts
index a63089f1ef..65bd894d63 100644
--- a/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.ts
+++ b/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.ts
@@ -7,4 +7,5 @@ import * as FernRegistry from "../../../../../../../../../index";
 export interface ObjectType {
     extends: FernRegistry.TypeId[];
     properties: FernRegistry.api.v1.read.ObjectProperty[];
+    extraProperties: FernRegistry.api.v1.read.TypeReference | undefined;
 }
diff --git a/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.ts b/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.ts
index 3572009463..7eebf134c3 100644
--- a/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.ts
+++ b/packages/fdr-sdk/src/client/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.ts
@@ -7,4 +7,5 @@ import * as FernRegistry from "../../../../../../../../../index";
 export interface ObjectType {
     extends: FernRegistry.TypeId[];
     properties: FernRegistry.api.v1.register.ObjectProperty[];
+    extraProperties: FernRegistry.api.v1.register.TypeReference | undefined;
 }
diff --git a/packages/fdr-sdk/src/converters/db/convertAPIDefinitionToDb.ts b/packages/fdr-sdk/src/converters/db/convertAPIDefinitionToDb.ts
index 50fb46271a..e4ab652119 100644
--- a/packages/fdr-sdk/src/converters/db/convertAPIDefinitionToDb.ts
+++ b/packages/fdr-sdk/src/converters/db/convertAPIDefinitionToDb.ts
@@ -569,6 +569,7 @@ function transformShape({ writeShape }: { writeShape: APIV1Write.TypeShape }): F
                 type: "object",
                 extends: writeShape.extends,
                 properties: writeShape.properties.map((property) => transformProperty({ writeShape: property })),
+                extraProperties: writeShape.extraProperties,
             };
         case "alias":
             return {
@@ -644,6 +645,7 @@ function transformDiscriminatedVariant({
             properties: writeShape.additionalProperties.properties.map((property) =>
                 transformProperty({ writeShape: property }),
             ),
+            extraProperties: undefined,
         },
     };
 }
diff --git a/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.d.ts b/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.d.ts
index c280793e44..105e2394cf 100644
--- a/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.d.ts
+++ b/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/read/resources/type/types/ObjectType.d.ts
@@ -5,4 +5,5 @@ import * as FernRegistry from "../../../../../../../../../index";
 export interface ObjectType {
     extends: FernRegistry.TypeId[];
     properties: FernRegistry.api.v1.read.ObjectProperty[];
+    extraProperties: FernRegistry.api.v1.read.TypeReference | undefined;
 }
diff --git a/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.d.ts b/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.d.ts
index e798753222..6de26b7491 100644
--- a/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.d.ts
+++ b/servers/fdr/src/api/generated/api/resources/api/resources/v1/resources/register/resources/type/types/ObjectType.d.ts
@@ -5,4 +5,5 @@ import * as FernRegistry from "../../../../../../../../../index";
 export interface ObjectType {
     extends: FernRegistry.TypeId[];
     properties: FernRegistry.api.v1.register.ObjectProperty[];
+    extraProperties: FernRegistry.api.v1.register.TypeReference | undefined;
 }