Question: Where is the estate that Donald Trump owns that was previously owned by Marjorie Merriweather Post?

Context articles: Merriweather Post Pavilion
Mystery on Fifth Avenue
Camp Topridge
The Causeway (Washington, D.C.)
Upper St. Regis Lake
Marjorie Merriweather Post
Hillwood Estate, Museum &amp; Gardens
Benjamin A. Muncil
Merriweather Post Pavilion (album)
Mar-a-Lago

Merriweather Post Pavilion is an outdoor concert venue located within Symphony Woods, a 40-acre (162,000-m²) lot of preserved land in the heart of the planned community of Columbia, Maryland.
 In 2010, Merriweather was named the second best amphitheater in the United States by "Billboard" magazine.
 The venue was also ranked as the fourth best amphitheater in the United States by "Rolling Stone" in 2013.
 It was again ranked by Consequence of Sound at number 29 of all music venues in the nation out of 100 in 2016.
"Mystery on Fifth Avenue" is the title of a "New York Times" article written by Penelope Green in June 2008 about a mystery apartment on Fifth Avenue in New York City.
 The apartment, a 4,200-square-foot luxury co-op formerly inhabited by Marjorie Merriweather Post and E.F. Hutton, was purchased by Wall Street mogul Steven B. Klinsky and his wife Maureen Sherry for $8.5 million.
 They hired architectural designer Eric Clough and his firm 212box for the renovation, during which Clough embedded an extensive mystery in the apartment in the form of riddles, ciphers, puzzles, and hidden objects, for Klinsky and Sherry's four children.
 It was done without his clients' knowledge, and they did not discover the mystery until several months after moving in.
Camp Topridge is an Adirondack Great Camp bought in 1920 and substantially expanded and renovated in 1923 by Marjorie Merriweather Post, founder of General Foods and the daughter of C. W. Post.
 The "camp", near Keese Mill, in the U.S. state of New York, was considered by Post to be a "rustic retreat"; it consisted of 68 buildings, including a fully staffed main lodge and private guest cabins, each staffed with its own butler.
 It was one of the largest of the Adirondack great camps and possibly the most elaborately furnished.
The Causeway, also known as the Tregaron, is a country house estate located in the Cleveland Park neighborhood of Northwest, Washington, D.C..
 The estate was designed by Charles A. Platt and constructed in 1912.
 The original occupants, the Parmelees, lived at the estate from its construction until 1940.
 From 1940 to 1958 it was occupied by Joseph E. Davies, who had served as the ambassador for the United States to Luxembourg, Belgium, and the Soviet Union and his second wife Post Cereal Company heiress Marjorie Merriweather Post.
 Today the estate is occupied by a campus for the Washington International School and the Tregaron Conservancy.
742 acre Upper St. Regis Lake is a part of the St. Regis River in the Adirondacks in northern New York State.
 Along with Lower St. Regis Lake and Spitfire Lake, it became famous in the late 19th century as a summer playground of America's power elite, drawn to the area by its scenic beauty and by the rustic charms of Paul Smith's Hotel.
 It is the site of many grand old summer "cottages" and Great Camps, including Marjorie Merriweather Post's Topridge.
 Frederick W. Vanderbilt, Anson Phelps Stokes and Whitelaw Reid were among the summer residents.
 "The camps of many of these families began as tent colonies, with separate units for sleeping, dining, games, and so on, and evolved into permanent structures built with understated taste."
Marjorie Merriweather Post (March 15, 1887 – September 12, 1973) was a leading American socialite and the owner of General Foods, Inc.
 She used much of her fortune to collect art, particularly pre-revolutionary Russian art, much of which is now on display at Hillwood, the museum that was her estate.
 She is also known for building Mar-a-Lago, an estate now owned by Donald Trump.
Hillwood Estate, Museum & Gardens is a decorative arts museum in Washington, D.C., United States.
 The former residence of businesswoman, socialite, philanthropist and collector Marjorie Merriweather Post, Hillwood is known for its large decorative arts collection that focuses heavily on the House of Romanov, including Fabergé eggs.
 Other highlights are 18th and 19th century French art and one of the country's finest orchid collections.
Benjamin A. Muncil (28 Aug 1867 – 16 Dec 1930) was an American master builder in the Adirondacks early in the 20th century.
 He was a major figure in the architectural development of the Adirondack Great Camps; among his many projects was Marjorie Merriweather Post's Camp Topridge, Northbrook Lodge, and White Pine Camp, a summer White House of US President Calvin Coolidge.
Merriweather Post Pavilion is the eighth studio album by American experimental pop group Animal Collective, released in January 2009 on Domino Records.
 It peaked at No. 16 on the "Billboard" 200 and No. 2 on the US Top Independent Albums charts.
 According to review aggregate site Metacritic, "Merriweather" was the most critically acclaimed album of 2009, and went on to sell a total of 200,000 copies.
 It spawned the singles "My Girls" (named the Best Song of 2009 by "Pitchfork" and "Slant Magazine"), "Summertime Clothes", and "Brother Sport".
Mar-a-Lago ( ) is a resort and National Historic Landmark in Palm Beach, Florida, built from 1924 to 1927 by cereal-company heiress and socialite Marjorie Merriweather Post.
 The 126-room, 62,500-square-foot house contains the Mar-a-Lago Club, a members-only club with guest rooms, a spa, and other hotel-style amenities.
 It is located