partner-contact/base_location/company_view.xml

<?xml version="1.0"?>
<openerp>
  <data>
    <!-- Add cities to the company form -->
    <record id="view_company_form_city" model="ir.ui.view">
      <field name="name">res.company.form.city</field>
      <field name="model">res.company</field>
      <field name="inherit_id" ref="base.view_company_form"/>
      <field name="arch" type="xml">
        <field name="street2" position="after">
          <field name="better_zip_id"
                 options="{'create_name_field': 'city'}"
                 colspan="4"
                 on_change="on_change_city(better_zip_id)"
                 placeholder="City completion" />
        </field>
      </field>
    </record>
  </data>
</openerp>