The properties, a number of which were built for members of the Thayer family, lie on Mason Road, just north of the town line with Dublin.

The most significant property of the six is the 140-acre (57 ha) Skyfield estate, whose large Georgian Revival mansion was designed by Lois Lilley Howe and built in 1916.

[1] Skyfield is a three-story U-shaped brick building, with a long main block and two projecting wings, and was built to replace an earlier Shingle style house.

These wood-frame structures include a barn (since remodeled for year-round residential use), an icehouse, laundry, toolshed, and garage.

[2] Several houses on Mason Road were built for members of the Thayer family around the turn of the 20th century.