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Long, Tann & D’Onofrio, Inc. has demonstrated excellence in structural engineering for a wide range of clients continuously for 80 years.

Recent Work

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University of Delaware

University of Delaware

Education / Museums

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WF Cooke Elementary School

WF Cooke Elementary School

Education / Museums

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Winterthur Museum Building

Winterthur Museum Building

Education / Museums

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We strive to build partnership teams with owners, architects and contractors, further enhancing the effective delivery of our structural engineering consulting services.


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Contact us to learn how LT&D can help on your next project.