Executive Team



Jonathan Kaufman Iger is the Chief Executive Officer of Sage Realty Corporation. He joined the firm in the fall of 2010 as Vice President. He provides supervision and leadership to the financial, construction, property management, and leasing divisions. He also codirect the company’s investing activities, property acquisitions and dispositions, and oversees all new development initiatives. Mr. Iger is an officer of Sage Realty Corporation and is very proud to be the fourth-generation involved in the Kaufman family business.

Prior to his arrival at Sage, he served as Vice President at P&L Investments, LLC, a boutique real estate investment and asset management firm specializing in the acquisition, management, and work out of non-performing and sub-performing assets, including brownfield properties. From 2005 to 2008, Mr. Iger was the CEO & Founder of UrbanGradRealty, a boutique residential brokerage company focused on the recent college graduate submarket.

Jonathan Iger currently serves on the Board of the Meatpacking Area Business Improvement District as Treasurer. He is a member of the advisory board for the Center of Real Estate and Urban Analysis at George Washington University as well as a member of the 1819 Society of The Town School. He is an active supporter of the New York Public Library, the Museum of Modern Art and The Metropolitan Museum of Art. He is a former Trustee of The Washington Institute for Near East Policy.



Boris Katsman serves as the Chief Financial Officer of Sage Realty Corporation. He joined the firm in 2017. He directs the finance department, codirects the company’s investment activities and provides oversight and leadership to the asset management department.

Prior to joining Sage Realty Corporation, he was the Chief Financial Officer for Slate Property Group, a vertically-integrated owner, operator and developer of residential and commercial real estate in the New York metropolitan area. Before joining Slate Property Group, Boris served as Vice President of Finance and Controlling for Paramount Group, Inc., a best-in-class owner, operator and manager of Class A office properties. Boris oversaw financial reporting for the company’s properties totaling approximately 12.6 million square feet and funds with aggregated committed capital in excess of $2.0 billion. Additionally, Boris assisted Paramount with the successful completion of the largest-ever IPO by a U.S. REIT. Earlier in his career, Boris served as a Manager at Deloitte & Touche, LLP, where he specialized in providing audit and consulting services to the firm’s largest real estate clients. Boris graduated from the University of Albany with a Bachelor of Science degree in Accounting and minors in Business Administration and Economics.



Michael Lenchner joined Sage Realty Corporation in June of 1990. Mr. Lenchner now serves as Vice President and Director of Leasing. His primary responsibility is the day-to-day negotiations, oversight and coordination of all leasing transactions in the Sage Realty Corporation portfolio, including both agency assignments and tenant representation. In addition, he plays an active role in the management of Sage Realty Corporation and serves as an officer and shareholder of the company. Keen negotiating skills, steady leadership and a thorough knowledge of the marketplace has made Michael Lenchner one of the most respected and well-­known commercial real estate executives in New York City.

During his tenure he has completed leasing transactions totaling in excess of 4.5 million SF with a transactional value in the billions of dollars. Among some of the larger deals are the 550,000 SF net lease to Goldman Sachs at 77 Water Street, the 430,000 SF lease renewal with Grey Global Group at 777 Third Avenue, the 345,000 SF lease renewal with Omnicom Group, Inc. at 437 Madison Avenue, the 271,150 SF lease to Avon Products at 777 Third Avenue, the 100,952 SF lease to Lewis, Brisbois, Bisgaard & Smith at 77 Water Street, the 98,600 SF lease to HSS Properties at 777 Third Avenue, and the 102,032 SF lease to Theory Holdings at 2 Gansevoort Street.

Other recent notable leasing transactions on behalf of The William Kaufman Organization include deals with United Healthcare, Munich RE, Citizens Bank, Montgomery McCracken Walker & Rhoads, Arup Services, AT&T, Wiggin & Dana, Aecom, HQ Global Workplaces, Toppan Vite, Kekst and Co., Six Continents Hotels, Morelli Alters Ratner, FedEx Kinkos, Douglas Lane & Associates, Hudson Bay, Sompo Japan Insurance, Stroock & Stroock & Lavan, Carnegie Corporation, Wells Fargo Bank, Monness Crespi Hardt, SEI Investments, ITN Networks, Inc., Christian Brothers lnvestment, and Visa USA.



Theresa Fesinstine joined Sage Realty as the Director of People & Culture in 2017. With over 17 years of experience as a senior human resources professional, she is responsible for developing and implementing the organization’s long-term people operations strategy. Theresa has in-depth specialization in organizational development, performance management, talent acquisition, employee development, and employee engagement. 
Before joining Sage, Theresa spent three years providing HR Consulting services to a variety of industries including advertising technology, non-profit asset management, and workforce management solutions. Prior to that, Theresa was with News America Marketing – a division of News Corporation – for over 14 years, where she served as the VP of Human Resources. In this role, she was responsible for the HR strategy and operations of over 800 professionals in the areas of media, marketing, creative services, sales, and digital technology. During her tenure, she was awarded the “Global Excellence Award” twice, and News America Marketing was given the notation of “100 Best Entry Level Jobs” by the Princeton Review. Theresa earned her Bachelor of Arts degree from the University of Memphis. She is an active member of SHRM and NYHRPS where she plays an essential role in developing the marketing strategy for the organization. Additionally, Theresa is an active volunteer with the New York Cares organization, where she spends time supporting and coaching individuals preparing to reenter the workforce.



Glenn DiBiase joined Sage Realty Corporation in 1989 as Property Manager at 17 State Street. Mr. DiBiase now serves as Vice President and Director of Property Management & Construction. His primary responsibility is the day-to-day operation and facility management of Sage Realty Corporation’s 3M+ square foot portfolio. In addition, he plays an active role in the management of Sage Realty Corporation and serves as an officer and shareholder of the company.

Mr. DiBiase began his career with the Helmsley Spear organization in 1976 as a 32B/J summer replacement where he had the opportunity to start learning the business from the bottom up by covering the porter, elevator operator, and security positions. He came back after graduating college in the spring of 1977 and has been in the business ever since. In 1979 he received his NYC refrigeration license and joined Tishman East Management as a Local 94 Operating Engineer. He stayed with them until 1989 as they evolved into William A. White and then Grubb & Ellis, moving up from Engineer to Chief Engineer, then Building Manager and finally to Operations Manager of a two-million-square-foot portfolio.

Mr. DiBiase graduated from The State University of New York at Farmingdale, AAS Air Conditioning, Heating & Refrigeration in 1977. He holds a BOMI International RPA designation and his real estate salesperson license.



Mr. Lauth joined Sage Realty in 1996. He is an officer of the company, serving as Director of Asset Management. He provides oversight and leadership to the construction management and leasing departments. He is involved in the company’s investing activities, property acquisitions and dispositions. As Director of Asset Management he directly oversees the company’s analytics and due diligence groups.

He previously served as Associate Director of Construction Management, overseeing the bidding for all construction and tenant improvement projects. He monitored the construction progress to ensure projects were completed on time and on budget. Prior to assuming this role, Mr. Lauth was Assistant to the President of Sage Realty. As such he was involved in all aspects of the day-to-day operation of the portfolio.



Mark Iger originally joined Sage Realty Corporation in 1979. He currently serves as Special Counsel to the Company and Special Counsel to the President of Sage Realty Corporation. Prior, he served as General Counsel and Co-Director of Leasing. He is a practicing attorney specializing in real estate and trust and estate planning in the state of New York for over 30 years.

He is an active developer of real estate in New York and New Jersey, independent of Sage Realty Corporation. He currently serves on the Board of Consor, an intellectual asset management company. He was previously Co-Founder and CEO of NAMES International, an international licensing company, and COO of Shortpath (previously Building Networks), a real estate based SAAS company.

He serves on the Board of Trustees at Connecticut College. In addition, Mr. Iger is an active supporter of a multitude of civic and art related institutions throughout New York City and is the President of his Co-Op board.