Question: Roberta Brooke Astor, was an American philanthropist, socialite, and writer who was the chairwoman of the Vincent Astor Foundation, and great-great grandson of America's first multi-millionaire John Jacob Astor, a German–American businessman, merchant, real estate mogul and investor who mainly made his fortune in fur trade and by investing in real estate in or around where??

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American Fur Company: The American Fur Company (AFC) was founded in 1808, by John Jacob Astor, a German immigrant to the United States.  During the 18th century, furs had become a major commodity in Europe, and North America became a major supplier.  Several British companies, most notably the North West Company and the Hudson's Bay Company, were eventual competitors against Astor and capitalized on the lucrative trade in furs.  Astor capitalized on anti-British sentiments and his commercial strategies to become one of the first trusts in American business and a major competitor to the British commercial dominance in North American fur trade.  Expanding into many former British fur-trapping regions and trade routes, the company grew to monopolize the fur trade in the United States by 1830, and became one of the largest and wealthiest businesses in the country.

William Backhouse Astor Sr.: William Backhouse Astor Sr. (September 19, 1792 – November 24, 1875) was an American business magnate who inherited most of his father John Jacob Astor's fortune.  He worked as a partner in his father's successful export business.  His massive investment in Manhattan real estate enabled major donations to the Astor Library in East Village, which became the New York Public Library.

Colonnade Row: Colonnade Row, also known as LaGrange Terrace, on present-day Lafayette Street in New York City's NoHo neighborhood, is a landmarked series of Greek revival buildings originally built in the early 1830s.  They are believed to have been built by Seth Geer, although the project has been attributed to a number of other architects.  The buildings' original name comes from the Marquis de Lafayette's estate in France, but the series of nine row houses, of which four remain, owe their existence to John Jacob Astor, who bought the property and whose grandson John Jacob Astor III later lived at No. 424.  The buildings are listed on the National Register of Historic Places under the name LaGrange Terrace and the facades remain standing on Lafayette Street south of Astor Place.

Anthony Dryden Marshall: Anthony Dryden Marshall (born Anthony Dryden Kuser; May 30, 1924 – November 30, 2014) was an American theatrical producer and C.I.A. intelligence officer and ambassador.  He was also at one-time the vice president of the Vincent Astor Foundation, which was established by his stepfather, Vincent Astor.  In 2010, after a lengthy and well-publicized trial, he was convicted of numerous crimes relating to the handling of the estate of his late mother, Brooke Astor.  After being imprisoned for several weeks in mid-2013, he was granted medical parole on August 22, 2013.  Marshall died on November 30, 2014 at the age of 90.

Baron Astor of Hever: Baron Astor of Hever, of Hever Castle in the County of Kent, is a title in the Peerage of the United Kingdom.  It was created in 1956 for the prominent newspaper proprietor and Conservative politician the Hon. John Jacob Astor.  He was the fourth child of William Waldorf Astor, 1st Viscount Astor.  Lord Astor of Hever was succeeded by his eldest son, the second Baron.  He served as Lord Lieutenant of Kent between 1972 and 1982.  s of 2013 the title is held by the latter's eldest son, the third Baron, who succeeded in 1984.  He is one of the ninety elected hereditary peers who remain in the House of Lords after the passing of the House of Lords Act of 1999, and sits on the Conservative benches.  As a descendant of the first Viscount Astor, Lord Astor of Hever is also in remainder to this peerage and its subsidiary title Baron Astor, of Hever Castle in the County of Kent.

Brooke Astor: Roberta Brooke Astor (née Russell; March 30, 1902 – August 13, 2007) was an American philanthropist, socialite, and writer who was the chairwoman of the Vincent Astor Foundation, which had been established by her third husband, Vincent Astor, son of John Jacob Astor IV and great-great grandson of America's first multi-millionaire, John Jacob Astor.  Brooke Astor was the author of two novels and two volumes of personal memoirs.

John Jacob Astor VI: John Jacob "Jakey" Astor VI (August 14, 1912 – June 26, 1992) was an American socialite, shipping businessman, and member of the Astor family.  He was dubbed the ""Titanic" Baby" for his affiliation with the RMS "Titanic"; Astor was born four months after his father, Colonel John Jacob Astor IV, died in the sinking of the "Titanic", but his mother, Madeleine Astor, survived.

John Jacob Astor: John Jacob Astor (July 17, 1763 – March 29, 1848) (born Johann Jakob Astor) was a German–American businessman, merchant, real estate mogul and investor who mainly made his fortune in fur trade and by investing in real estate in or around New York City.

Ava Alice Muriel Astor: Ava Alice Muriel Astor (July 7, 1902 – July 19, 1956) was an American heiress, socialite, and member of the Astor family.  She was the daughter of John Jacob Astor IV and Ava Lowle Willing, and sister of Vincent Astor.

Real estate investing: Real estate investing involves the purchase, ownership, management, rental and/or sale of real estate for profit.  Improvement of realty property as part of a real estate investment strategy is generally considered to be a sub-specialty of real estate investing called real estate development.  Real estate is an asset form with limited liquidity relative to other investments, it is also capital intensive (although capital may be gained through mortgage leverage) and is highly cash flow dependent.  If these factors are not well understood and managed by the investor, real estate becomes a risky investment.  The primary cause of investment failure for real estate is that the investor goes into negative cash flow for a period of time that is not sustainable, often forcing them to resell the property at a loss or go into insolvency.  A similar practice known as flipping is another reason for failure as the nature of the investment is often associated with short term profit with less effort.

Supporting paragraphs: Brooke Astor John Jacob Astor
Answer: New York City