He took over the post from Phil Miller. Buccleuch Property managing director David Peck will act as vice-chairman for 2010-11.
Naish's tenure began at a reception at Edinburgh's Caledonian Hilton Hotel. The event was attended by more than 190 industry and public sector delegates from across Scotland, who heard a speech by Scotland's chief planning officer Jim Mackinnon.
Naish qualified as a chartered surveyor in 1976 and has more than 35 years' experience in the real estate industry. Previously he was director and head of DTZ Investment Management and co-founded Fountain Capital Partners in 2002.
"Our industry's property markets remain fragile. We are also seeing an increasingly polarised market between London and the rest of the UK," he said.