Old Structures Engineering, PC

Recognized as one of the leading consultancies in structural engineering for historic and old buildings, Old Structures Engineering (OSE) provides reports, drawings, and specifications that give detailed guidance to owners, designers, and contractors, enabling the preservation, restoration, and alteration of landmarked and other older structures. Donald Friedman, Marie Ennis, Michael Lo, and Mona Abdelfatah, the firm’s principals, are widely acknowledged as experts in this field, known both for the breadth of their experience and for their contributions to advancing the knowledge and practice of this specialty.

OSE is a Certified B Corporation.

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90 Broad Street, Suite 1501
New York NY 10004.

212-244-4546. See our Staff page for individual extensions and emails.

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