William West joined the Charles H. Greenthal Management Corp. after leaving the Air Force in 1960. He began his career as a rental agent and then advanced to managing agent. Mr. West eventually became the head of the Management Division, supervising a staff of over 125 people and managing the assets of over 150 properties, comprising over 20,000 units. When the real estate environment shifted in the late 1970s and early 1980s, Mr. West converted over a dozen rental buildings to cooperative and condominium buildings and conducted all negotiations with the tenant groups and their lawyers. He has been involved in the sale of over 25 properties valued in excess of $100 million.

As Chief Executive Officer and Chairman of the Charles H. Greenthal Management Corp., he enjoys the benefits of direct personal experience with all aspects of management, renting, leasing, commercial negotiations, sales of units and buildings and mortgage refinancing. He remains in constant communication with Greenthal's clients and personally attends to their needs. Mr. West also serves on numerous boards.

Jonathan S. West has been involved in all aspects of New York City real estate for over 25 years. After beginning his career and working his way up through the ranks of the Lefrak Organization, he joined the Charles H. Greenthal Management Corp. Mr. West a licensed real estate broker in New York and Connecticut, and he holds a New York State insurance license. He serves on the boards of numerous cooperatives and condominiums and is a member of the board of directors of the Real Estate Board of New York (REBNY).

Mr. West's responsibilities at Greenthal include overseeing landlord-tenant relations, lease renewals, implementation of management procedures and the expansion of Greenthal's portfolio. He has also been responsible for numerous large garage and commercial leasing transactions for tenants such as JP Morgan Chase Bank, Capital One Bank, Bank of America, North Fork Bank, Shake Shack, D'Agostino, 9 West and Eddie Bauer. Most recently he was responsible for Greenthal's purchase of Mark Greenberg Real Estate (MGRE). Charles H. Greenthal Management Corp. now manages over 37,000 residential units and 1,300,000 square feet of commercial space across over 250 properties located in New York City, Nassau and Westchester Counties valued at over $68 billion dollars.

Under his leadership Greenthal has been named Management Company of the Year, Greenthal managed buildings are consistently cited by the Cooperator in their annual "Top Ten Best Buildings" list and the company has been rated one of the top 25 third-party managers by the National Multi-Housing Council.

Mr. West has received a Certificate of Recognition from the Office of Senator Jose Peraltz, a Citation from the New York State Assembly, a Citation of Honor by the Borough of Queens, an award from the Building Managers' Association and has been honored by Kings of Queens and the Queens Courier.

Personally, Mr. West donates his time and money to the Wounded Warrior Project. He and his wife, Staci, who have two daughters, Alexa and Jamie, are involved in various children's charities. They have helped fund special children's play rooms at Sloan Kettering and New York University Hospitals for use by children in need of special health care.

A veteran of the real estate industry for more than 40 years, Albert E. Mayas joined Charles H. Greenthal Management Corp. in 1996. Prior to joining Greenthal, Mr. Mayas was a Senior Vice President at American Landmark Management Corp., a Senior Vice President and Director of Operations at Brown Harris Stevens, Inc. and Vice President of Douglas Elliman-Gibbons & Ives. Mr. Mayas began his career as a Property Manager at Orsid Realty Co. He twice received the Management Achievement Award from New York Habitat magazine, both Manhattan Resident Managers Club and Metropolitan Building Mangers Club named him Manager of the Year, and he was honored with the Residential Management Community Service Award from the Real Estate Board of New York.

A member of the Real Estate Board of New York, he has served on the Management Division Board of Directors, the Insurance Committee, the Building Codes and Regulations Committee, and is a current member of the Residential Management Council. Other affiliations include the Realty Advisory Board in Labor Relations, Advisory Committee for the Building Services Union’s Thomas Shortman Training School (Local 32 B/J Service Employees Union) and the Board of Trustees for the Manhattan Residents Managers Foundation. Mr. Mayas is also a Vice President of The Bridge, Inc., a non-profit organization offering mental health services, housing and vocational training for individuals with psychiatric illnesses, including veterans in need as well as individuals returning to the community after incarceration or hospitalization.

Mr. Mayas has a Bachelor of Science in Anthropology from City College of the City University of New York and a certificate in real estate.

Timothy J. O’Keefe brings over 29 years of industry experience as a Real Estate Operations Executive and is an expert in building maintenance, engineering, construction and asset management.

Tim has been responsible for overseeing over 150 property management staff professionals and ensures a high level of performance and productivity within each real estate asset. He has been successful in helping his clients reduce on-going maintenance costs and improving building efficiency.

Tim’s professional experience includes, but is not limited to, working with private real estate equity groups, as well as publicly traded asset management companies across the country. He is widely regarded as a residential management expert, but is equally competent in real estate development, having assisted in developing assets worth more than $500 million.

Tim attended Fordham University in Bronx, NY as well as The University of Dayton in Ohio. He continues his real estate education and is continually looking to give back to an industry that has given him so much.

James R. Letsen has been a Property Manager since 1984, and has coordinated the rehabilitation of eight residential apartment buildings in Westchester County. Jim graduated from Mercy College carrying a double major of management and finance and completed Commercial and Real Estate Management courses at New York University Institute of Real Estate. Prior to entering the real estate industry Jim served as a police officer with the Westchester Department of Public Safety.

Since joining Greenthal in 1990 as an Account Executive he manages a variety of class A properties throughout New York City, supervising on-site personnel. He keeps well informed about changing laws and regulations and is knowledgeable about building systems and mechanics.

Jim, who enjoys an excellent reputation as an honest, conscientious and well-respected real estate professional, also serves his community as a Vice-Chairman of St. Johns Riverside Hospital and is Chairman of the board of Yonkers parks and recreation

James Goldstick, a graduate of Boston University with a major in business administration, has served as Vice President of Greenthal’s MGRE Division since 1999. Involved in all facets of New York City real estate for over 30 years, he joined MGRE in 1982 as a Property Manager and became Director of Sales and Leasing in 1990.

James specializes in consulting with board members regarding communication of the financial condition and legal issues of properties and the impact they might have on prospective purchasers and refinancing possibilities. He provides board members an analysis of complex financial and legal issues that are confronted by cooperatives and condominiums and the development of strategies to resolve those issues.

James lectures frequently for professional organizations such as the Council for New York Cooperatives, and annual Habitat magazine conferences. Some recent lecture topics include exercising the right of first refusal in cooperatives, maximizing income for cooperatives and condominiums, forcing sponsors to sell apartments and how to deal with crisis in cooperative apartment buildings.

Among James responsibilities at MGRE are board member relations, procuring new business and supervising sponsor management relationships. During the past 10 years Greenthal’s MGRE division has received numerous industry awards including New York City management company of the year.

Steven Greenbaum is Director of Property Management at Greenthal. He has been involved in all facets of New York City real estate for over 40 years. Having joined MGRE in 1985 as a Property Manager, he quickly became Director of Property Management in 1987.

Steven is directly responsible for the operation and performance of Greenthal's Property and Asset Management Divisions. He personally trains and mentors each Greenthal MGRE Account Executive, to ensure the uniform superior competence of the entire management staff. His personal attention and hands on approach has evolved this division into one of the few residential management organizations in metropolitan New York recognized for both outstanding and innovative service delivery with an unwavering commitment to professionalism, honesty and integrity.

A Registered Apartment Manager (RAM), a New York Accredited Realty Manager (NYARM), and (CPM) Certified Property Manager, he regularly leads seminars and symposiums on various topics in the industry and has won multiple management industry awards for his expertise in the areas of property management, financial management and major capital improvements.

Steven Graduated from Brooklyn College with a BA in Political Science and is a graduate of New York University Real Estate Institute.