Start creating an Address value object.

app/models/address.rb

@@ -0,0 +1,3 @@
+class Address
+  attr_reader :street, :street2
+end

spec/models/address_spec.rb

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+require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
+
+describe Address do
+  describe '(fields)' do
+    before(:each) do
+      @address = Address.new
+    end
+
+    it "should have two street fields" do
+      [:street, :street2].each do |m|
+        @address.should respond_to(m)
+      end
+    end
+  end
+end