The sale history for 9305 Soundview Avenue runs one line, and the line is this listing. The house went up in 1972 on 1.68 acres between Soundview Avenue and Great Pond, the county record shows no sale since, and the family that built it is the family selling it now. Five decades of single ownership left the original design intact: parquet laid across the pond-facing great room, oak wainscot under cube ceiling lights, a spiral stair winding to a lower level walled in whitewashed rough-sawn plank. Four bedrooms and three and a half baths in 4,241 square feet, with a pool, a pavilion and a shingled barn on the grounds. It reaches the market September 4, and for the first time the front door opens to people the family did not invite.