diff --git a/libs/contact/src/lib/contact-model.ts b/libs/contact/src/lib/contact-model.ts
index df754da..1be95b7 100644
--- a/libs/contact/src/lib/contact-model.ts
+++ b/libs/contact/src/lib/contact-model.ts
@@ -1,20 +1,20 @@
 export interface Name {
-  firstName?: string;
-  lastName?: string;
-  middleName?: string;
-  prefix?: string;
-  suffix?: string;
+  firstName: string;
+  lastName: string;
+  middleName: string;
+  prefix: string;
+  suffix: string;
 }
 
 export interface Address {
-  line_1?: string;
-  line_2?: string;
-  city?: string;
-  state?: string;
-  postalCode?: string;
+  line_1: string;
+  line_2: string;
+  city: string;
+  state: string;
+  postalCode: string;
 }
 
 export interface Contact {
-  name?: Name;
-  addresses?: Address[];
+  name: Name;
+  addresses: Address[];
 }
diff --git a/libs/contact/src/lib/services/contact.service.ts b/libs/contact/src/lib/services/contact.service.ts
index 04269c4..282a559 100644
--- a/libs/contact/src/lib/services/contact.service.ts
+++ b/libs/contact/src/lib/services/contact.service.ts
@@ -14,12 +14,14 @@ const contact: Contact = {
   addresses: [
     {
       line_1: '123 Main Street',
+      line_2: null,
       city: 'New York',
       state: 'NY',
       postalCode: '12345',
     },
     {
       line_1: '123 South Street',
+      line_2: null,
       city: 'Boston',
       state: 'MA',
       postalCode: '54321',