The Winthrop Mansion

The Winthrop Mansion 15 East 81st Street New York, New York DECEMBER 2023

CHRISTIE'S INTERNATIONAL REAL ESTATE ---GROUP---

Christie?s NYC Auction House display in Rockefeller Center, New York Cit y

CHRISTIE'S INTERNATIONAL REAL ESTATE -----GROUP-----

Dear Mr. Kutayba Alghanim, c/ o Green Drake Corporation We are honored to present this proposal for the marketing and sale of your home. Leveraging the extensive resources of Christie's International Real Estate, the world's premier luxury real estate network, our powerhouse team of Edward Joseph and Smitha Ramchandani offers not only market-leading local expertise with a history of record-breaking sales, but also unparalleled global exposure. You will benefit from sophisticated marketing programs that connect high-end buyers and generate greater visibility for your home, including exclusive syndication to top-tier real estate and news websites. Our team speaks over six languages, is multiculturally fluent, and is significantly involved in the foremost international real estate organizations which expand our influence and your home's exposure.

Additionally, our partnership with the venerable Christie's auction house creates unique opportunities and collaborations that transcend traditional luxury marketing venues. A brand synonymous with luxury, quality, and integrity, Christie's is the best platform for success for remarkable properties like 15 East 81st We will provide you a truly impeccable, first-class home sale experience and will make the buying and selling process enjoyable.

Thank you for considering our services, and we look forward to connecting with you soon.

Sincerely, Edward and Smitha

Edward Joseph Licensed Associate Real Estate Broker + 1 917 821 6225 EJoseph@christiesrealestategroup.com Christie's International Real Estate Group

Smitha Ramchandani Licensed Associate Real Estate Broker + 1 973 953 7777 SmithaR@christiesrealestategroup.com Christie's International Real Estate Group

The Christie's Advantage

CHRISTIE'S INTERNATIONAL REAL ESTATE --GROUP--

Chr istie's Her itage Christie?s is a name that speaks of extraordinary art and international glamour but paramount is the unparalleled customer service and expertise clients receive. Founded in 1766, Christie?s has conducted the greatest and most celebrated auctions over the centuries. Today, Christie?s offers hundreds of auctions annually across a multitude of categories, including fine and decorative arts, jewelry,photographs, collectibles, and wine.

Christie?s has a global presence in 46 countries, with salerooms around the world, including London, Paris, Geneva, Milan, Amsterdam, Dubai, Hong Kong, Shanghai, and New York Cit y. The business philosophy established in 1766 defines our approach to real estate today - one that is founded on trust, integrit y, discretion, and expertise.

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Christie's Auction House House Christie's Auction 10 salerooms 46 10countries salerooms

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Christie’s International Real Estate

• Christie’s Auction House Salerooms

Christie’s Auction House Salerooms

• Christie's International Real Estate Office Locations

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Curated Network of Real Estate Specialists Representing CURATED NETWORK OF REAL ESTATE SPECIALISTS REPRESENTING

11,000 ˜ Number of Luxury

Properties Worldwide

US$43B

Value of Luxury Properties Worldwide

Properties by price (number of properties)

US$500B ˜ Real Estate Sales Over the Last Five Years

Properties by region (value of properties)

Across the globe, discerning luxury buyers and sellers trust Christie’s and Christie’s International Real Estate to deliver tailored service and exceptional results.

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At a Glance: Chr istie's Inter national Real Estate -

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Through our network of leading real estate brokers and New York Cit y brokerage, Christie's International Real Estate is the global authorit y in the marketing and selling of luxury properties the network achieved approximately $500 billion in sales over the last five years

Christie's Brokerage Sales Highlights Canal- Facing Residential Building of Modern Design Dubai, United Arab Emirates Sold in excess of $100,000,000 | Fall 2021 *Strict confidentialit y clauses preclude divulging additional information regarding the building or the transaction.

Fairwater - Point Piper New South Wales, Australia $100,000,000 | September 2018

Tarpon Island Palm Beach, Florida $85,000,000 | July 2021

1028 Ridgedale Drive Beverly Hills, California $66,250,000 | August 2018

Contemporary Farmhouse Holmby Hills, California $70,000,000 | May 2018

The Homestead Whitefish, Montana $55,000,000 | June 2021

15 Cent ral Park West , PH 16/ 17B New York, New York $50,000,000 | April 2018

Starwood Drive Aspen, Colorado $48,000,000 | June 2022

443 Greenwich, PHA New York, New York $43,700,000 | May 2018

One Beacon Court , PH 51/ 52W New York, New York $30,000,000 | June 2021

Christie's Brokerage Active Listing Highlights

The Safar Estate Costa Smeralda, Italy $252,366,000

Equest rian Estate in Perl- Borg Saarland, Germany $71,325,000

Villa NEO St. Barthelemy $66,889,000

Valley Trunk Estate British Virgin Islands $48,000,000

The Kenzo House Paris, France $41,695,000 10

Villa II Gabbiano Cala Di Volpe, Italy $32,915,000

Christie's on King Street in London, the historical home of Christie's since the 18th Century.

At a Glance: Chr istie's -

Founded in 1766 by James Christie Approximately 350 sales annually in 80 categories Achieved $8.4 billion in global sales in 2022 The first international fine art auction house to operate independently in mainland China, now with offices opened in Shanghai and Beijing

Sales Highlights

20th Cent ury Evening Sale

Visionary: The Paul G. Allen Collection CO- Founder of Microsoft

New York, November 17, 2022 New York, November 9- 10, 2022 -

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Works featured by the Impressionist artists in Paris to the notorious Pop artists of New York art scene such as Claude Monet and Edgar Degas to Mark Rothko and Willem de Kooning Sale achieved $307.9 million

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The highest grossing single sale ever in auction history Sale achieved more than $1.6 billion Proceeds devoted by the estate entirely to philanthropic causes

The Collection of Andre Leon Talley New York, February 15, 2023 -

A selection of custom couture, personalized handbags, artwork, and more Sale achieved more than $1.3 million Proceeds from the live and online auctions to benefit the Abyssinian Baptist Church in New York and Mt. Sinai Missionary Baptist Church in Durham, Nort Carolina; both of which were close to Mr. Talley's heart

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Chr istie?s Inter national Real Estate Group

As an exclusive Affiliate of Christie?s International Real Estate, the world?s premier luxury real estate network, Christie?s International Real Estate Group not only offers market- leading local expertise but also unparalleled exposure across the globe. Our flagship office is located at 1 Rockefeller Plaza in New York Cit y, adjacent to Christie?s auction house on 49th street. We represent Christie?s International Real Estate in New York, New Jersey, and Connecticut with more than 30 offices and 1,000 associates.

We provide a number of sophisticated marketing programs that connect high- end buyers and create greater visibilit y in the marketplace, including exposure on our website, christiesrealestate.com, and digital syndication to several top- tier real estate and news websites. Additionally, Christie?s International Real Estate?s synergy with the venerable Christie?s auction house creates unique opportunities and collaborations that transcend traditional luxury marketing venues.

A brand synonymous with luxury, qualit y and integrit y, Christie?s International Real Estate Group offers the very best platform for success for remarkable properties.

Fujita Sale at Christie's- 2020

Our Team DECEMBER 2023

CHRISTIE'S INTERNATIONAL REAL ESTATE --GROUP--

The Christie?s International Real Estate Masters Circle includes an elite group of high- performing luxury real estate specialists from across our global network. The selection of these members is based on their local success, passion and expertise. The exclusive circle is comprised of approximately 200 real estate professionals representing 22 countries and 24 U.S. states.

The areas of market expertise range from waterfront, equestrian, mountain, and ski to vineyards, developments, urban, and more. The Masters Circle is reserved for the network?s top producers in terms of luxury sales volume, number of luxury transactions and listings, and faithful representation of the Christie?s International Real Estate brand values. Masters Circle members are the best of the best in the Christie?s International Real Estate network.

Edward Joseph and Smitha Ramchandani have been members of the Masters Circle since it was created in 2018. Being a member provides invaluable networking and event opportunities for agents to gain unique exposure to top brokers and an exclusive global client base.

Edward Joseph Licensed Associate Real Estate Broker Christie's International Real Estate Group

Edward Joseph bring s to each transact ion not only incomparable service, but a long list of accomplishments in real estate sales. Edward has been recog nized as a frequent "Broker of the Month", as well as one of t he top NYC listing ag ents. His reputation in the luxury market is beyond reproach. Edward's townhouse sales have set records for the hig hest prices in the indust ry. His knowledg e of t he townhouse market and his skillful pricing have created a loyal client base who reach out to him ag ain and ag ain. Edward bring s the same ent husiasm to t he sales of co- operatives and condominiums. Most of all, Edward is reg arded as a consummate professional, and a broker who makes t he buying and selling process not only less st ressful, but truly enjoyable.

Prior to his career in Real Estate, Edward was a successful t heatre director. He started directing in his hometown of Cleveland, Ohio t hen founded his own t heatre company in Denver, Colorado. The t heat re business broug ht Edward to New York, where he directed many off- Broadway product ions. His directing skills were easily transferable to Real Estate. In his own words: "My Real Estate philosophy is: 'I don't believe in shortcuts.' When I work with sellers or buyers, t hey are g iven 110% of my energ y, enthusiasm, and expert ise. One of t he reasons for my success is my firm belief that the buying and selling process revolves around t he customer's needs.

Every individual situat ion is different - - t here are no boilerplates here! Every real estate transaction reflects this. Real estate is about life. Just know t hat when you're ready, I'll be ready."

Smitha Ramchandani Licensed Associate Real Estate Broker Christie's International Real Estate Group

Smitha Ramchandani is a hig hly successful real estate ag ent and t he Director of International Partnerships for Christie's International Real Estate Group in New York Cit y. Smit ha and her team are reg ularly recog nized as one of the top teams in sales across the indust ry. Smitha is known for her innate abilit y to deliver a smooth, seamless t ransaction and her unmatched knowledg e of the reg ion. With more t han 25 years of experience, Smitha is committed to delivering the hig hest levels of customer and client service for each and every transact ion. Smit ha has been feat ured in Forbes, Business Insider, Real Estate Business Mag azine, Apart ment Therapy, and count less other local and reg ional media out lets. Wit h her t remendous success, deep experience and affiliation with Christ ie's International Real Estate, Smitha is able to utilize Christ ie's superior market ing resources and t heir unmatched customer service to g uide clients at every step of t he real estate process.

Smitha was born in Mumbai, India and immig rated to t he United States in her 20s. She came armed with an American dream and t he ent repreneurial drive to succeed in g rowing a world- class business. Smitha is fluent in five Indian lang uag es and offers a g lobal reach to her clients. She is licensed in New York, New Jersey and California and has been named in t he Wall St reet Journal's Top 1000 Real Estate Professionals list in t he United States.

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Meredith Langs Marketing & Communications Manager Christie's International Real Estate Group Meredith is the Marketing & Communicat ions Manag er for Christie?s Internat ional Real Estate Group - New York Cit y at the flag ship office located at 1 Rockefeller Plaza. Prior to joining the NYC office, Meredit h worked for t he Christie?s International Real Estate office, handling the marketing for propert ies all around t he g lobe. This g ranted her invaluable experience with internat ional markets and allowed her to build st rong relationships with affiliate offices.

Meredith is responsible for creat ing and handling all NYC brand market ing , as well as supporting the individual ag ents in t he NYC office. This includes print market ing , dig ital market ing , social media, public relat ions, event planning , and st rateg y. Meredith represents the corporate marketing team while assist ing ag ents in creat ing proposals and attending list ing presentations as needed. She also has a hand in recruit ment and training to help ag ents better understand how to take full advantag e of t he market ing opport unit ies and platforms t hat t he company offers.

Meredith also has a role in org anizing and host ing net working / list ing events, as well as represent ing New York Cit y when attending international corporate events.

Additionally, she creates the market ing materials t hat will be present , and provides content for the social media team. Meredit h reviews all web content and ensures all listing s and subject matter present t he brokerag e and ag ents in t he best possible lig ht. She also works to ensure New York Cit y listing s are represented t hroug h all international channels including social media pag es, t he Luxury Defined Blog , t he Christie?s Internat ional Real Estate Mag azine, t he Auct ion House Sales, website banner ads, and more.

Meredith holds a Bachelor of Arts (BA) in Film and Media St udies from Bucknell Universit y where she played Division 1 g olf. She g ained experience t hroug h her st udies and internships with the Adobe Creat ive Suite, videog raphy, photog raphy, writ ing , market ing and communicat ions. Her previous jobs have included a focus on film product ion, marketing and sales which provided her wit h valuable experience in client- facing work as well as creat ive technolog y and market ing prog rams.

Sherri A Balassone Vice President & Corporate Broker of Record Christie's International Real Estate Group Sherri's unique experience in sales, rentals and real estate brokerag e law dist ing uishes her in the New York State real estate industry. She specializes in New York State real estate brokerag e law with an expertise in fair housing , real estate licensing , real estate cont inuing educat ion, residential propert y sales and leasing transactions. In addition to working as a Licensed Associate Real Estate Broker for close to a decade, Sherri is a member of the New York State Bar and held the position of Senior Attorney at Abrams Garfinkel Marg olis Berg son, LLP, where she worked in conjunction with Broker Counsel to the Real Estate Board of New York (?REBNY?). Sherri has worn many hats throug hout her career in the resident ial real estate indust ry including attorney, New York State cont inuing education instructor for real estate licensees, sales and leasing associate broker for two brokerag e firms and on- site leasing manag er for a larg e New York Cit y landlord.

Advising and instructing over 15,000 members of REBNY and ot her real estate licensees on laws that affect their daily transactions offered Sherri a rare perspect ive on the real estate industry. She used this perspective to help g uide REBNY and ot her org anizations in considering and incorporating a real estate licensee?s point of view when proposing new reg ulat ions and laws.

Training real estate licensees to use best practices and remain compliant with trade association reg ulations as well as federal, state and local laws is a passion of hers.

Sherri?s practice of the law enabled her to master pert inent contracts ut ilized by real estate brokerag es. She has drafted numerous leg al documents for real estate brokerag e firms across New York Cit y, which has g iven her the expertise necessary to identify and resolve complex issues relating to Independent Cont ractor Ag reements, Exclusive List ing Ag reements and Rental Fee Ag reements, just to name a few.

Before entering the real estate industry, Sherri g raduated with honors from Pace Universit y School of Law in 2011. Previously, she enjoyed a successful career in biotech/ pharmaceut ical sales. While working in the biotech industry, Sherri was chosen for jury dut y which sparked g reat interest and turned her attention to the law. An underg raduate Bachelor of Arts deg ree from Assumpt ion Universit y with a focus on Business Communications has proven to be an asset when presenting to both small and larg e g roups, live and on film.

Christie?s Hong Kong Spring and Summer 2023 auctions achieved record results with worldwide participation from 48 countries across 6 continents.

Custom Marketing Plan DECEMBER 2023

CHRISTIE'S INTERNATIONAL REAL ESTATE --GROUP--

Marketing Services

The Winthrop Mansion I 15 East 81st Street I December 202.3

Christie's Auction House Exposure - Property will be showcased at the Christie's Auction House located at 20 Rockefeller Plaza - Property will be displayed at the 49th Street Auction House Windows - Property will be included in Bespoke Video Montage displayed on the christiesrealestate.com homepage as well as in every auction house location {including Amsterdam, Dubai, Geneva, Hong Kong, London, Milan, New York, Paris and Shanghai) - Property will be included in Luxury Living Booklet that will be on display during all auctions and events

The Real Deal Partnership Exposure - Social Media Promotion through The Real Deal account with a reach of over 345K followers - Banner ads promoting the property live on therealdeal.com - Dedicated video showcasing the property on a guided tour that will be promoted on therealdeal.com, The Real Deal social media, The Real Deal E-Newsletters, and all Christie's International Real Estate Group outlets - Strategic press attention driven by Christie's International Real Estate PR team - Strategic outreach by Magrino PR firm, owned by Susan Magrino - Property will be submitted for ongoing themed article opportunities across various high-level media outlets

Public Relations - Strategic press attention driven by Christie's International Real Estate PR team - Strategic outreach by Magrino PR firm, owned by Susan Magrino - Property will be submitted for ongoing themed article opportunities across various high-level outlets

Website and Digital Marketing - Placement on search engine optimized propert y web page on Christie?s International Real Estate website (christiesrealestate.com) - Promotion on social media channels such as Facebook, Instagram, TikTok and LinkedIn (International and New York) - Strategic paid social media advertising targeting potential buyers - Dedicated feature on The Luxury Defined Blog - Propert y promoted on premium partner websites: - Barron?s, Country Life (UK,) Financial Times, James Edition, Mansion Global (English, Chinese, Spanish,) MarketWatch, PropGOLuxury.com (U.S. and Asia,) Wall Street Journal (US, Europe, Asia, India) - Digital campaign through Adwerx. A custom designed digital banner ad that displays on high- qualit y sites and targeting those that are in- market for real estate - Custom digital banner advertising campaign ? programmatic digital advertisements promoted via the Google Display Network and Facebook Ad Campaign

Print Marketing - Creation and distribution of custom brochure to showcase the propert y - Professionally produced postcard distributed to announce listing of the propert y - Custom Cover and spread in the Christie?s International Real Estate magazine distributed to top Christie?s clients and displayed in the auction houses globally - Inclusion in Luxury Living Booklets distributed to Christie?s clients at upcoming auctions and major events with 6- month shelf life

Print Advertising - New York Times

- Mansion Global

- Wall Street Journal

- Financial Times

- The Robb Report

- Hamptons Magazine

- Architectural Digest

- The New York Post

Marketing Services Continued

The Winthrop Mansion I 15 East 81st Street I December 202.3

Tailored Property E-Card - Creation of custom property eCard showcasing the property to be sent to: - Agents' cultivated client list, Christie's network agents, top agents, local luxury builders and developers, and strategic business partners

National and International Syndication - Daily Digital Advertisements on Media Partner Websites: - Wall Street Journal: wsj.com, Europe.wsj.com, Asia.wsj.com, lndia.wsj.com - Mansion Global (English, Chinese, Spanish) - Countrylife.co.uk - PropGoluxury.com (U.S. and Asia) - James Edition - Financial Times - Barron's - MarketWatch

Listing and Syndication - The property will be listed in the primary listing source for the RLS - The property will be syndicated to multiple nationally recognized real estate search websites

Entrance of Christie's auction house at 20 Rockefeller Plaza, New York Cit y

Comparative Market Analyis DECEMBER 2023

CHRISTIE'S INTERNATIONAL REAL ESTATE --GROUP--

Sold Proper ties

Van Norden Mansion 8 East 62nd Street Reduced Sale Price $48,000,000 Original List Price $84,500,000 Sold September 2020

6 Beds | 9 Baths | 14,700 SF

Sold Proper ties

12 East 69th Street Reduced Sale Price $59,000,000 Original List Price $88,000,000 Sold in March 2021

6 Beds | 6+ Baths | 20,000 SF

12 East 63rd Street Reduced Sale Price $56,000,000 Original List Price $61,000,000 Sold in January 2022

7 Beds | 8F 3H Baths

36 East 68th Street Reduced Sale Price $52,750,000 Original List Price $60,000,000 Sold in December 2022

6 Beds | 8F 4H Baths

9 East 71st Street Reduced Sale Price $51,000,000 Original List Price $88,000,000 Sold in March 2021

10 Beds | 15 Baths | 28,000 SF

Active Listings

973 Fifth Avenue List Price $ 65,000,000 Listed on 5/17/23 210 Days on Market

10 Bed/ BF 1H Bath/ 16,000 SF

Active Listings

36 East 63rd Street List Price $60,000,000 Listed on 4/27/23 210 Days On Market

10 Beds / 10F 1H Baths / 15,875 SF

4 East 79th Street List Price $ 65,000,000 Listed on 8/9/23 126 Days on Market

6 Beds / 6F 4H Baths / 15,200 SF

Our Analysis and Recommendation

15 East 81st Street New York, New York

The Winthrop Mansion stands as an exquisite and unparalleled architectural gem steeped in historical significance. This distinguished residence boasts an immaculate preservation of its original design and intricate detailing. The captivating narrative that envelopes the Winthrop house only enhances our abilit y to showcase this exceptional propert y.

What truly sets this mansion apart is its remarkable dimensions. With an astonishing width spanning approximately 60 feet and a depth of 95 feet, combined with an astounding total square footage of over 16,000 square feet, it unequivocally ranks among the largest and most coveted homes in all of New York Cit y.

Furthermore, the inclusion of outdoor spaces, a private roof deck, and a pool elevate the propert y to new heights of luxury living.

Attached herewith, you will find a list of comparable homes on the Upper East Side, encompassing both recent sales and current listings.

Taking into account the prevailing dynamics of the real estate market, we hold firm in our belief that 15 East 81 Street will command a price range of $75,000,000 to $85,000,000 when it officially enters the market, contingent upon market conditions at that time.

We are truly privileged to present this proposal for your careful consideration. Please feel free to reach out to us at any time with any questions.

CHRISTIE'S INTERNATIONAL REAL ESTATE ---GROUP---

New York City

1 Rockefeller Plaza, Suite 2402 New York, NY, 10020, USA London 8 King Street, St. James's London, UK Hong Kong 22nd Floor, Alexandra House 18 Chater Road, Central, Hong Kong

christiesrealestategroup.com