partner-contact/partner_address_street3/views/res_partner.xml

<flectra>

    <record id="view_partner_form" model="ir.ui.view">
      <field name="name">add street3 in form view</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.view_partner_form" />
      <field name="arch" type="xml">
        <xpath
                expr="/form/sheet/group/group/div/field[@name='street2']"
                position="after"
            >
          <field
                    name="street3"
                    placeholder="Street 3..."
                    class="o_address_street"
                    readonly="type == 'contact' and parent_id != False"
                />
        </xpath>
        <xpath
                expr="/form//field[@name='child_ids']/form//field[@name='street2']"
                position="after"
            >
          <field name="street3" placeholder="Street 3..." class="o_address_street" />
        </xpath>
        <xpath
                expr="/form//field[@name='child_ids']/kanban/field[@name='street2']"
                position="after"
            >
          <field name="street3" />
        </xpath>
      </field>
    </record>

    <record id="res_partner_kanban_view" model="ir.ui.view">
      <field name="name">add street 3 in kanban</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.res_partner_kanban_view" />
      <field name="arch" type="xml">
        <field name="street2" position="after">
          <field name="street3" />
        </field>
      </field>
    </record>

    <record id="view_partner_address_form" model="ir.ui.view">
      <field name="name">add street 3 in res.partner.form.address</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.view_partner_address_form" />
      <field name="arch" type="xml">
        <field name="street2" position="after">
          <field name="street3" placeholder="Street 3..." class="o_address_street" />
        </field>
      </field>
    </record>

    <record id="res_partner_view_form_private" model="ir.ui.view">
      <field name="name">add street 3 in res.partner.form.private</field>
      <field name="model">res.partner</field>
      <field name="inherit_id" ref="base.res_partner_view_form_private" />
      <field name="arch" type="xml">
          <field name="street2" position="after">
              <field
                    name="street3"
                    placeholder="Street 3..."
                    class="o_address_street"
                />
          </field>
      </field>
    </record>

</flectra>