gbNYC’s principals are a multi-disciplinary, high-caliber team uniquely qualified to provide senior level real estate counsel to corporations, a service that delivers a real and robust bottom-line impact to our clients. We are experienced real estate and construction professionals with extensive expertise in real estate, construction, sustainability, and risk management. Our expertise in New York City brokerage, unequaled network of green real estate contacts, and commitment to green building practices ensure that we deliver the highest degree of professionalism and integrity at every level, and on every deal.

Alanna Martin, J.D., LEED AP
Principal Broker

Alanna is a licensed commercial real estate broker certified by the U.S. Green Building Council as a LEED Accredited Professional and gbNYC’s Principal Broker. Alanna is a graduate of Brooklyn Law School and Columbia University, and has completed coursework at New York University’s Real Estate Institute. She has closed dozens of commercial real estate transactions of every size and type. In her spare time, she is an active member of Redevette, a women’s real estate development consortium.

Stephen Del Percio, B.Eng., J.D., LEED AP 
Blog Publisher

Stephen founded gbNYC in 2006 and was one of the first ten attorneys in the country to earn the LEED AP designation. He currently practices real estate and construction law in Manhattan, holds a degree in civil engineering from Columbia, and is a graduate of William & Mary Law School. In addition to maintaining gbNYC’s magazine, Stephen also publishes gbNYC’s sister publication, the Green Real Estate Law Journal, which discusses legal issues impacting the green building industry. He is a frequent lecturer on legal and other topics of interest to industry professionals.

Brian Wennersten, LEED AP

Brian Wennersten is an experienced LEED Accredited Professional who has worked as a consultant on projects ranging from commercial office buildings, airport towers, retail centers, and higher education buildings. He currently serves as the Principal of SKYed Eco Education and teaches green building education courses at the AIA NY Center for Architecture and Bergen Community College. Brian holds an Environmental & Business Economics degree from Rutgers University and is a member-elect of the Rutgers University Alumni Association Board.

David Roth

David Roth is an editor at The Classical, co-writes The Daily Fix blog-column at the Wall Street Journal, and writes “The Mercy Rule” column at He has written extensively about real estate in New York City both here at gbNYC and elsewhere, and his work has also appeared in The New Republic and the Wall Street Journal, among other publications.