SEVERAL of Dublin's leading housebuilders are likely to be competition next Friday for a large apartment site at St Helen's, Booterstown, on the Stillorgan Road, Co Dublin. Likely contenders include Shannon Homes, O'Malley Construction, Ballymore Homes, Cosgrave Homes and Sheelin Homes. A price of between £7 million and £9 million is likely to be achieved for the site, which will be auctioned by joint agents Gunne and Ross McParland.