(516) 222-0222 kbda@brownaltman.com

The firm’s partners are seasoned local counsel who have more than thirty years of combined legal experience in the complex and evolving practice of commercial real estate law and litigation.

The firm combines expert knowledge of the law with a commitment to efficiency and responsiveness to the needs of our clients.

As skilled litigators, the firm’s partners have won many significant real estate and commercial litigation cases in both federal and state courts.

The partners’ extensive litigation experience offers a comprehensive approach to reach our clients’ intended objectives.

Keith P. Brown


Keith P. Brown is a founding partner of Brown & Altman, LLP. Mr. Brown’s practice concentrates on corporate representation in a wide range of real estate matters, from complex commercial disputes to issues related to zoning and land use regulations. He counsels many corporations on liability avoidance, real estate development, and compliance with federal and state environmental laws, regulations and litigation.

Along with his long-time friend and law partner, David N. Altman, Mr. Brown has been credited with playing a significant role in the development of the telecommunication industry infrastructure on Long Island. Since the onset of the industry’s rise in 1999, Mr. Brown has been at the forefront, representing wireless carriers and tower developers alike.

With the mindset of an entrepreneur, Mr. Brown has leveraged his extensive knowledge and experience representing many Fortune 500 companies into several business ventures of his own.

Before founding Brown & Altman, Mr. Brown was a partner and managing attorney for the law firm of Amato & Associates, P.C., where he supervised the caseload and administration of an 18-attorney staff. Prior to his tenure there, Mr. Brown was counsel in the Litigation Department of the prestigious law firm of McMillan, Rather, Bennett & Rigano, P.C. and an Assistant Attorney General in the Litigation Bureau of the New York State Attorney General’s Office. He began his legal career in 1994 as an associate at Siben & Siben, LLP.

Mr. Brown earned his B.A. from the State University of New York at Albany in 1990 and his Juris Doctorate from Touro College in 1994, where he founded and was Editor-in-Chief of the Touro Environmental Law Journal.

Mr. Brown comes from a long line of politicallyand civically-minded family members; his father, Hon. Harry Richard Brown, was a well-respected New York State Supreme Court Justice. Mr. Brown carries on his family’s tradition, actively participating in many local professional and charitable organizations. He resides in Huntington, NY with his wife Barbara and their three sons – Aidan, Hunter and Sean.

Mr. Brown is admitted to practice in New York and Connecticut, the U.S. District Courts for the Southern and Eastern Districts of New York and the Second Circuit United States Court of Appeals. He is a member of the New York State Trial Lawyers’ Association, the American Bar Association and its state and local affiliates.

David N. Altman



David N. Altman, Esq., is a founding partner of Brown & Altman LLP. An attorney with extensive experience in real estate law, commercial litigation and environmental law, Mr. Altman has, over the course of his career, handled a broad range of matters involving zoning and municipal law, commercial and residential transactional real estate, environmental law, commercial and civil litigation and corporate and commercial transactions.

Mr. Altman has represented commercial and residential real estate developers, residential and commercial lenders and has been involved in all phases of site development, with particular expertise in the development of sites for the wireless telecommunications industry. He has worked with major national corporations, including Fortune 500 businesses, as well as local businesses in various aspects of the retail, commercial and industrial sectors. As a land-use attorney, he has practiced in municipalities throughout Long Island, as well as New York City. In addition, he served as transactional counsel to several commercial and residential lenders.

Prior to establishing Brown & Altman, Mr. Altman was a founding partner in the Smithtown law firm of DeBenedittis & Altman, P.C., handling commercial real estate matters, and commercial and civil litigation. Previously, he was a partner and head of litigation at Amato & Associates, P.C., Garden City. Mr. Altman also served as Of Counsel to Vincent J. Trimarco, Esq. in Smithtown, where he specialized in zoning and land use and commercial law.

Mr. Altman received his Juris Doctorate from the Hofstra University School of Law in 1990. He graduated in 1987 from the State University of New York at Binghamton, earning a Bachelor of Arts degree in history with a minor in political science.

A longtime resident of Long Island, David Altman is committed to the continued exploration of clean, sustainable energy sources that benefit Long Island’s businesses and residences.
Mr. Altman is admitted to the New York State Bar and the United States District Court for the Eastern District of New York and the Second Circuit U.S. Court of Appeals. He is a member of the New York State Bar Association and the Suffolk County Bar Association.

Michael DiLeo



Michael DiLeo is well-versed in the field of commercial real estate. Most recently, Michael operated his own real estate investment and consulting firm, where he assisted commercial lenders and hedge funds in facilitating various real estate financing arrangements and loans to real estate developers. He also invested in his own commercial real estate projects, while maintaining his commercial and residential real estate legal practice. His background includes handling such matters as 1031 exchanges, tenants-in-common transactions, industrial development agency work, as well as mezzanine lending and bridge loan financing.

Prior to operating his own business, Michael was a Senior Associate at Phillips, Lytle LLP, in New York City, where he concentrated on asset-based lending transactions, workouts and commercial litigation. He began his legal career at the prestigious law firm of Rivkin, Radler, LLP in Uniondale, New York.

Michael received his law degree from the Hofstra University School of Law in 1994, where he was a member of the Labor Law Journal. He received a Bachelor of Science degree in Finance with a minor in International Relations from Fairfield University.

He is a member of the New York State and Connecticut State Bars, as well as the U.S. District Courts for the Southern and Eastern Districts of New York.

Michael serves on the Town of Oyster Bay Save Environmental Assets Fund Advisory Committee and the Town of Oyster Bay Landmarks Preservation Commission. He is also active in and serves on the Board of Directors of other local civic and charitable organizations.

Michael played collegiate lacrosse at Fairfield University and is active in youth lacrosse on Long Island.

Raised in Massapequa, Michael now resides in Sea Cliff with his wife, Michele, and their four sons. Michael enjoys outdoor activities, including golf and skiing with his family and friends.

John Anzalone


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Chase Sandler


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