Hopson-Swan Estate is a national historic district

Historic district (United States)

In the United States, a historic district is a group of buildings, properties, or sites that have been designated by one of several entities on different levels as historically or architecturally significant. Buildings, structures, objects and sites within a historic district are normally divided...

 and estate

Estate (house)

An estate comprises the houses and outbuildings and supporting farmland and woods that surround the gardens and grounds of a very large property, such as a country house or mansion. It is the modern term for a manor, but lacks the latter's now abolished jurisdictional authority...

 located at Sparkill

Sparkill, New York

Sparkill, formerly known as Tappan Sloat, is an affluent, suburban hamlet in the Town of Orangetown, Rockland County, New York, United States located north of Palisades; east of Tappan; south of Piermont and west of the Hudson River...

 in Rockland County, New York

Rockland County, New York

Rockland County is a suburban county 15 miles to the northwest of Manhattan and part of the New York City Metropolitan Area, in the U.S. state of New York. It is the southernmost county in New York west of the Hudson River, and the smallest county in New York outside of New York City. The...

. It encompasses three contributing buildings and one contributing structure. The district is located within the boundaries of Tallman Mountain State Park

Tallman Mountain State Park

Tallman Mountain State Park is a New York State Park located in the Town of Orangetown in Rockland County, New York, adjacent to the Hudson River. It is located just south of Piermont and includes part of Piermont Marsh, which is included in the Hudson River National Estuarine Research Reserve...

 and was acquired by the Palisades Interstate Park Commission

Palisades Interstate Park Commission

Palisades Interstate Park and its creator, the Palisades Interstate Park Commission, was formed in 1900 by governors Theodore Roosevelt of New York and Foster M. Voorhees of New Jersey in response to the destruction of the Palisades by quarry operators in the late 19th century...

 in 1947. The estate was developed between about 1850 and 1920. The house is a -story frame house on a stone foundation. It was constructed in three phases: about 1850, expanded and restyled in 1869, and also about 1920. Also on the property is a cast iron gazebo

Gazebo

A gazebo is a pavilion structure, sometimes octagonal, that may be built, in parks, gardens, and spacious public areas. Gazebos are freestanding or attached to a garden wall, roofed, and open on all sides; they provide shade, shelter, ornamental features in a landscape, and a place to rest...

 and two small carriage house

Carriage house

A carriage house, also called remise or coach house, is an outbuilding which was originally built to house horse-drawn carriages and the related tack.In Great Britain the farm building was called a Cart Shed...

s.

It was listed on the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

in 1992.