Conrad Buff III, 62, a well-known architect whose clients included some of the biggest names in the entertainment world. Buff joined with Donald C. Hensman while the two were still architectural students at USC and formed their own firm. Over the years Buff-Hensman had more than 500 designs and commissions and built more than 6,000 structures. Buff-Hensman received dozens of awards, 30 from the American Institute of Architects alone. In Pasadena on Monday of cancer of the larynx.