A FOUR-storey over basement Georgian house in a tax designated area at 40 North Great George's Street, Dublin 1, is expected to make in excess of Pounds 200,000 when it is auctioned by Gunne on May 28th. The 6,500-square- foot building is ideal for conversion into apartments or for use as a single residence with offices at the lower levels, according to Denis O'Reilly of Gunne. Some of the large Georgian houses have already been converted into apartments and these, along with a number of apartment developments in the street in recent years, sold exceptionally well.