Question: Who built the both the Union Church of Pocantico Hills and and Kykuit?

Context paragraphs:
A.U.M.P. Church: The African Union First Colored Methodist Protestant Church and Connection, usually called "the A.U.M.P. Church," is a Methodist Christian denomination It was chartered by Peter Spencer (1782–1843) in Wilmington, Delaware, in 1813 as the "Union Church of Africans."  It was usually called the "African Union Church" until a Maryland offshoot of the A.M.E. Church (the "First Colored Methodist Protestant Church") merged into it in 1866, when the denomination added that church's name to its own.  A schism in the 1860s caused some of the congregations to form the "Union American Methodist Episcopal Church" in 1865.  The two denominations are now referred to collectively as the "Spencer Churches" (or, less often, the "Union Churches").

Kykuit: Kykuit ( ), known also as the John D. Rockefeller Estate, is a 40-room National Trust house in Westchester County, New York, built by order of oil tycoon, capitalist and Rockefeller family patriarch John D. Rockefeller.  Conceived largely by his son, John D. Rockefeller, Jr., and enriched by the art collection of third-generation scion, Governor of New York and Vice President of the United States, Nelson Rockefeller, it has been home to four generations of the family.

Union Church of Pocantico Hills: Union Church of Pocantico Hills is a historic church located at 555-559 Bedford Road in Pocantico Hills, New York.  The church was built by John D. Rockefeller, Jr. in 1921, as part of his plans to develop the town of Pocantico Hills, which was below his estate Kykuit.  Upon the death of Rockefeller's wife Abby Aldrich Rockefeller in 1948, their son Nelson Rockefeller had Henri Matisse design the church's rose window in honor of her memory shortly before the artist's own death in 1954.  When John D. Rockefeller, Jr. died in 1960, his children had artist Marc Chagall design a Good Samaritan window in his honor.  It is a one story neo-Gothic style building with fieldstone foundation and walls and a slate covered, highly pitched gable roof.  In 1930-1931, a parish hall was added to the east end of the church.

Union Church and Cemetery: Union Church and Cemetery is a historic Episcopal church and cemetery located at Falmouth, Stafford County, Virginia.  The property contains the archaeological sites of the 1733 and 1750s Falmouth Anglican churches and the standing remains of the Union Church, built about 1819.  The Union Church narthex, measuring 10 feet by 40 feet, is the section remaining from the Federal style building.  The building contains an original stairway to the balcony and framing that extends upward to form the belfry which supports an estimated 300-pound bell.  Also on the property is the church cemetery with headstones, dating from the 18th and the early 19th centuries through the 20th century.  A violent rain storm in 1950 severely damaged the roof of the 40 feet wide by 54 feet long church leading to a collapse of the chancel and nave, leaving only the narthex intact.

Pocantico Hills, New York: Pocantico Hills is a hamlet in the Westchester County town of Mount Pleasant, New York, northeast of the village of Sleepy Hollow and southwest of the village of Pleasantville, in the United States.  The area was originally settled by Native Americans of the Wecquaesgeek tribes; "Pocantico" means "running between two hills", and the name is a reference to the meandering Pocantico River.  Nestled between the Hudson River on the west and the Saw Mill River Parkway on the east, one finds pristine woodlands, brooks, 1000 acre of hiking trails, and nature walks an hour's drive from downtown Manhattan.

Stone Barns Center for Food &amp; Agriculture: Stone Barns Center for Food & Agriculture is a non-profit farm and educational center with a partner restaurant, Blue Hill at Stone Barns, located in Pocantico Hills, New York.  The Center was created on 80 acre formerly belonging to the Rockefeller estate in Pocantico Hills by David Rockefeller and his daughter, Peggy Dulany.  Stone Barns promotes sustainable agriculture, local food, and community-supported agriculture.  Stone Barns is a four-season operation.

Union Church of Port Royal: Union Church of Port Royal, also known as Port Royal White Union Church, 11th Street Tabernacle, and Free Church of Port Royal, is a historic church located at Port Royal, Beaufort County, South Carolina.  It was completed in 1878, and consists of a one-story, wood frame, brick-piered building with a central entry and portico.  It has a cupola containing the church’s belfry.  It was built with donated lumber by local citizens in 1877-1878 to provide the Port Royal community its only white house of worship at that time.

Union Church of Dunnigan: Union Church of Dunnigan (also known as Dunnigan Community Church) is a historic church located at 3615 County Road 89A in Dunnigan, California.  The Gothic Revival church construction began in 1892, and was completed in 1894.  Its design features pointed arch windows and doorways and a louvered bell tower with a working bell.  As a union church, the church was not connected to any specific denomination and was instead used for all community religious functions.  In addition to services for the community's various congregations, the church hosted visiting preachers, weddings, funerals, baptisms, and a yearly Christmas bazaar during the 1960s and 1970s.

Earlysville Union Church: Earlysville Union Church, also known as Earlysville Free Union Church, is a historic church located on VA 743, northwest of the junction with VA 633 in Earlysville, Albemarle County, Virginia.  It was built in 1833, and is a one-story, frame building with weatherboard siding and a gable roof on a low stone foundation.  Entrance to the building is by two doors on the south gable end.  It measures approximately 50 feet long by 30 feet wide.  The building was originally one room; a small vestibule with flanking rooms for Sunday School rooms was partitioned off around 1880.  It is a rare surviving example of interdenominational churches constructed at the beginning of the 19th century in Albemarle County.  It was used the Baptists, Methodists and Presbyterians until the turn of the 20th century.  The building continued in use as an

Union Church (New Haven, Vermont): Union Church, also known as the Union Church of New Haven Mills is a historic church at the junction of River Rd. and East Street in New Haven, Vermont.  Built in 1851, it is a fine local example of Greek Revival architecture with added Queen Anne Victorian features, and one of the oldest surviving buildings in a once-thriving mill village.  It was listed on the National Register of Historic Places in 2000.

Supporting paragraphs: Union Church of Pocantico Hills Kykuit
Answer: John D. Rockefeller