eiru_inmobiliaria/views/res_partner.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <record model="ir.ui.view" id="inmobiliaria_partner_form">
      <field name="name">inmobiliaria_partner_form</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.view_partner_form"/>
      <field name="arch" type="xml">
        <xpath expr="//page[@name='sales_purchases']" position="after">
          <page string="Propiedades" attrs="{'invisible':[('customer','=',True)]}">
            <group name="propiedades" string="Propiedades">
              <field name="propiedades_ids" nolabel="1" readonly="1">
                <tree string="Detalles">
                  <field name="name"/>
                  <field name="t_tamanho"/>
                  <field name="t_direccion"/>
                  <field name="t_descripcion"/>
                 </tree>
               </field>
             </group>
           </page>
         </xpath>
       </field>
    </record>
  </data>
</openerp>