Question: Elizabeth Christ Trump founded a real estate company with her son, who operated primarily in what city?

Context paragraphs:
Windermere Real Estate: Windermere Real Estate, a real estate company founded and based in the Windermere neighborhood of Seattle, Washington, was founded by John W. Jacobi in 1972, when he purchased an eight-agent office.  Still privately held, it is now the largest real estate company in the Pacific Northwest, with over 300 offices and 7,000 agents.

Signa Holding: Signa Holding GmbH (officially written as SIGNA) is Austria’s largest privately owned real estate company.  Signa was founded in 1999 by the Tyrolean entrepreneur René Benko.  Over the years, the two-man company with an initial focus on classic real estate development has become a pan-European real estate group with more than 150 employees and offices in Vienna, Innsbruck, Munich, Düsseldorf, Zurich and Luxembourg.  The principal focus of the Signa Group of Companies is the long-term investment in real estate in prime city centre locations.

Trump University: Trump University (also known as the Trump Wealth Institute and Trump Entrepreneur Initiative LLC) was an American for-profit education company that ran a real estate training program from 2005 until 2010.  It was owned and operated by The Trump Organization.  (A separate organization, Trump Institute, was licensed by Trump University but not owned by the Trump Organization.)  After multiple lawsuits, it is now defunct.  It was founded by Donald Trump and his associates, Michael Sexton and Jonathan Spitalny, in 2004.  The company offered courses in real estate, asset management, entrepreneurship, and wealth creation.

Business career of Donald Trump: Donald Trump is an American businessman, former television personality, and the 45th President of the United States.  He began his real estate career at his father's company, Elizabeth Trump and Son, which he later renamed to The Trump Organization.  He rose to public prominence after a number of successful real estate deals in Manhattan and New York City, and his company now owns and develops lodging and golf courses around the world.  Trump partly or completely owned several beauty pageants between 1996 and 2015.  He has marketed his name to many building projects and commercial products.  Trump's unsuccessful business ventures have included several casino and hotel bankruptcies, the folding of his New Jersey Generals football team, and the now-defunct Trump University.

Ivanhoé Cambridge: Ivanhoé Cambridge is a Canadian real estate company with assets around the globe.  Its areas of activity are investment, development, asset management, operations and leasing.  The Company's real estate portfolio consists primarily of shopping centres, office buildings and multiresidential properties.  It also has ownership interests in logistics services (storage and distribution) buildings, real estate investment funds and hotels.  The first entity in the real estate portfolio, Ivanhoe Corporation, was founded in 1953 by Sam Steinberg, the Montreal businessman who built Steinberg's grocery store chain.  Ivanhoé Cambridge, headquartered in Montreal, has more than 1,400 employees worldwide.  The value of its assets, located mostly in Canada, the United States, Europe, Brazil and Asia, totalled CA$56 billion at December 31, 2016.  Ivanhoé Cambridge is a real estate subsidiary of the Caisse de dépôt et placement du Québec, one of Canada’s biggest institutional fund managers.

Fred Trump: Frederick Christ Trump Sr. (October 11, 1905 – June 25, 1999) was an American real estate developer and philanthropist, primarily in New York City, and father of Donald Trump, the 45th President of the United States, and Maryanne Trump Barry, a United States Court of Appeals judge.

CapitaLand: CapitaLand Limited (Chinese: 凯德集团,), is a Singapore based real estate company.  Formed in November 2000 as a result of a merger of DBS Land and Pidemco Land, it is one of Asia's largest real estate companies headquartered and listed in Singapore.  The company leverages its significant asset base, design and development capabilities, active capital management strategies, and extensive market network and operational capabilities to develop high-quality real estate products and services.  Its two core markets are Singapore and China, while Indonesia, Malaysia and Vietnam have been identified as new growth markets.  The company also has one of the largest real estate fund management businesses with assets located in Asia.  CapitaLand’s listed real estate investment trusts (REITs) are CapitaLand Mall Trust, CapitaLand Commercial Trust, Ascott Residence Trust, CapitaLand Retail China Trust and CapitaLand Malaysia Mall Trust.

Elizabeth Christ Trump: Elizabeth Christ Trump (born Elisabeth Christ; October 10, 1880 – June 6, 1966) was a German-born American businesswoman and is considered the matriarch of the Trump family.  She married Frederick Trump in 1902.  While raising their three children, the early death of her husband in 1918 required her to manage his properties in order to support her family.  She founded the real estate development company Elizabeth Trump & Son with her son Fred.  The company, now known as The Trump Organization, is currently owned by her grandson, Donald Trump, who is the 45th President of the United States.  Her great-grandsons, Donald Trump Jr. and Eric Trump are running the family business as trustees during their father's presidency.

Funds from operations: Funds from operations (FFO) is the term that investors use in order to describe the cash flow of a real estate company or a real estate investment trust (REIT).  FFO is a performance indicator created by the National Association of Real Estate Investment Trusts (NAREIT) that is recognized by the SEC to be the standard non-GAAP gauge of financial performance for the real estate sector.  Analysts calculate the standard version of FFO by adding amortization and depreciation to net income, and subtracting any gains made on the sale of assets.  There are other forms of FFO that the SEC requires real estate companies to report such as the adjusted FFO, company FFO, and others.  No matter the type of FFO they use, public companies are required to disclose their FFO on their income statement.  Investors can use the FFO to determine the financial performance of a real estate company.  Unlike other accounting methods, the FFO attempts to remove distortion caused by traditional GAAP accounting methods.  Using the FFO allows companies to more accurately state their performance.  Often, the FFO is divided by a per-share basis for securities that are publicly traded.  Investors frequently utilize the FFO per-share ratio much like they would utilize the EPS of company.

Morris Goldseker: Morris Goldseker (December 24, 1898 - June 1973) was a real estate business tycoon, broker, and philanthropist.  He was President and Founder of M. Goldseker Real Estate Company, a Baltimore-based real-estate brokerage and services company, and is the founder of the Morris Goldseker Foundation.  Goldseker became a prominent real estate investor and broker and multi-millionaire in Baltimore during his forty-two years in the real estate business.

Supporting paragraphs: Elizabeth Christ Trump Fred Trump
Answer: New York City