HibernateTemplate findByNamedQuery : Native SQL Query

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I am using hibernateTemplate findByNamedQuery method to load the object.
This object has duplicate records .

Is their a way that i can load the object without duplicate records.???

Here is my NamedQuery which loads the Buildings object

<query name="findBuildings">
        <![CDATA[
            select DISTINCT buildings from com.XXX.model.Building buildings order by buildings.building
        ]]>
    </query>

The query works fine but it populates the dropdown with duplicate records
So i tried Native SQL query

<sql-query name="findBuildings"> 
     <return alias="obldg" class="com.boeing.nmt.nams.model.NamsBuilding"/>        
          SELECT  bldg.building AS {obldg.building}
          FROM Nams_Building bldg            
    </sql-query>

This query results in Invalid Column name

Any pointers/suggestions on how to avoid loading Objects without duplicate records will be highly appreciated