Firm Profile

Ysrael A. Seinuk, P.C. is an internationally recognized structural engineering firm founded in 1977. YAS has been responsible for the structural design of major office buildings, hotels, retail properties, educational, performing arts, sports and government facilities, as well as health care, hospital, laboratory, water pollution control plants, bridges and criminal justice facilities, together representing billions of dollars of construction. We have teamed up with numerous architecture firms for projects large and small spanning from a 3 million square foot mixed-use complex to small renovation tasks including historic preservation. Our firm has performed structural design services for projects located in many states, particularly from the Northeast through the Southern region. In addition, we have provided design services for international projects as well.

The firm has placed its mark of excellence on a wide spectrum of structures including new construction and extensive alteration and historic renovation project ranging from experience in the design of conventional renovations as well as seismic retrofits and complex rehabilitation projects that have preserved treasured historical structures.

The qualifications and acquired experience of our staff are among our greatest assets. Our teams are uniquely qualified to provide dynamic solutions to challenging projects. They are trained to produce the most efficient and economical structural solutions for our clients. Specialized personnel and equipment are assigned to each project to ensure optimal results. Our firm is thoroughly equipped to service projects in diverse locations.

Mixed Use

Our engineers have provided structural design services for major mixed use developments, ranging from the tallest concrete residential structure in the world to a sprawling one level nursing home in a wooded country setting. Among these residential and mixed-use projects are: Met 2, a building with two separate towers which are home to 41 stories in hotel rooms and 47 stories of office space; The Trump World Tower, the tallest concrete residential tower in the world when built; Tribeca Point; Riverside South, a complex of 32 to 50-story towers with infrastructure such as platforms and bridges spanning rail yards; Chelsea Stratus (W. 24th Street and Avenue of the Americas), 785 Eighth Avenue (winner of the 2009 CIB Award), 1355 First Avenue and 221 East 34th Street. We are also currently working on many projects in Florida, including the 3 million square foot Met Complex, which consists of a 43 story hotel, 47 story office building and a residential tower; the 50-story Solis Resort and Residences; the three-tower residential complex St. Tropez; The Loft 2 in Downtown Miami (which won the 2008 ACEC Silver Award for Excellence, in the category of Structural Systems); Ten Museum Park, Beach House, Cube and Midtown Towers. Our CEO, Professor Ysrael Seinuk has produced world renowned projects such as the AOL Time Warner Center in New York City.


Current international projects include the 2010 ACEC Diamond award winner, O-14 Tower in Business Bay, Dubai (noted for its perforated exterior concrete shell), the 53-story Panorama City complex (with twin triangular towers) in Central Europe, the Cancun Airport Control Tower, the 41-story Torre Reforma in Mexico City and the Yacht Repair Facilities in Maritime City, Dubai.

From among the dozens of cultural, educational and public facilities for which YAS has provided structural consulting services, we present this selection as examples of projects which serve to enrich our cultural environment: Carnival Center for the Performing Arts, Miami, FL; Burchfield-Penney Art Center, Buffalo State College, Buffalo, NY; The Graduate School and University Center, City University of New York, New York City, NY; Powdermaker Hall, Queens College, Queens, NY; The Gatehouse (also known as the "Monst") at Architect Philip Johnson′s Estate, New Canaan, CT; Madame Tussaud′s Wax Museum and 42nd Street Redevelopment at Times Square Complex boasting a 25 Screen AMC Theater and other entertainment and hotel facilities, New York, NY.; Historic preservation and renovation of the Liberty and Empire Theaters (involving moving an entire landmark building one full city block), New York, NY.

NYC Departament of Environmental Protection

YAS has been a sole structural engineer for several NYCDEP water pollution control plants and reservoir projects. These include:

Owls Head WPCP - YAS prepared preliminary and final structural designs for demolition and replacement of the plant facilities including the digester tanks, storage tanks, thickener tanks, gas extraction and gas holder tanks, aeration tanks, primary and final settling tanks and chlorine contact tanks. The project also included design of new administration building, odor control building, gas compressor building, grit and scum building and rehabilitation of the pump and power house, and other plant facilities.

Jamaica WPCP YAS is responsible for structural design and construction support services of administration building, thickener building, thickener electrical rooms, secondary screenings building, boiler plant addition and effluent water pump station.

North River WPCP Interim Plant Upgrade In this interim plant upgrade project, YAS performed evaluation for the existing plant access and prepared preliminary plans of three design alternatives for a new vehicular access ramp structure.

Hillview Reservoir YAS is responsible for structural design for modifications of the uptake and downtake chambers. Work also included concrete repairs and rehabilitation of the existing overflow conduit, wingwalls and modifications of the gate supports.

Renovations and Historic Preservation

We are particularly proud of our design for the renovation and preservation of Grand Central Station. A magnificent structure and an icon of New York City, Grand Central is frequented not only by commuters but also by visitors and tourists. Periodic events and exhibits are held in its cavernous public spaces making Grand Central very much a living museum.

At another famous New York City location, YAS Harlem USA project brought nine new movie screens to the vibrant 125th Street multi-use development. Further north, in the Bronx, we designed the structure for a theater and TV studios within Maria de Hostos Community College; also as part of a teaching facility, our design included a theater and TV studios at what is now called Long Island City High School in Queens, NY; additions and improvements made to the famous Jones Beach Theater, home to popular summertime concerts at Jones Beach State Park, Long Island, NY.


Some of our prominent hotel projects in New York include the Fairfield Hotel; the Trump International Hotel & Towers; the Westin New York at Times Square; The Hotel at Broadway & 48th Street; the 42nd Street Development Hotel over a movie theater complex; the Homestead Hotel; the 760-room Crowne Plaza Holiday Inn; and the Palace Hotel. Our hotel projects in Florida include the upgrade of the Loews Miami Beach Hotel; the 1600-room, plus 50,000 sq. ft. convention center at the Disney Dolphin Hotel in Epcot Center; the 815-room Hilton Hotel at Disney World in Orlando; and the Crowne Plaza Hotel in Tampa. Other prominent hotel projects include the Hyatt South Pier Hotel, Jersey City, NJ; and the 370-room Four Seasons Hotel in Philadelphia, PA

Schools and Universities

From among the dozens of university and college facilities for which YAS has provided structural consulting services, we present this group as representative of the diverse nature of the facilities, the institutions served, and the clients who have sought our services: Hunter College School of Social Work; Cornell University Stocking Hall; Suffolk Community College Life Sciences Building; SUNY Binghamton Science Building Addition; SUNY Fredonia Science and Technology Building; CUNY Brooklyn College Science Building; the Medical Research School, University of Rochester; Center for Excellence in Wireless and Information Technology, State University at Stony Brook; The Graduate School and University Center, City University of New York; Medical Laboratory Building, School of Medicine State University at Buffalo; West Quad, Brooklyn College; Powdermaker Hall and Remsen Hall, Queens College; Medgar Evers College, City University of New York; Kingsborough Academic Village, Kingsborough Community College, City University of New York; State University at Binghamton Field House and New Science Building Addition; St. John′s University Dorms; Hofstra University Dorms and Pedestrian Bridge; College of Aeronautics; Fiterman Hall, part of City University of New York′s Borough of Manhattan Community College; SUNY Maritime College and the Bronx Community College, City University of New York among many others.

YAS is responsible for structural design services for over 100 schools for the New York City School Construction Authority. Our most recent projects include an elementary/middle school in Battery Park City, PS 51M, PS 298, IS/HS 362, Eagle Academy and PS 79 in the Bronx, PS263M in upper Manhattan, and PS263, PS113 and PS798 in Queens. Our largest projects are the $92,000,000 HS of Law Enforcement with two regulation stacked gymnasiums as well as an auditorium, and the $90,000,000 West Queens High School. The Bronx High School of Law Government and Justice will unite the NYC educational community with Bronx Criminal Court Complex on an adjacent site. Queens Vocational High School and Maxwell High School in Brooklyn required $35,000,000 in extensive exterior and interior renovations. We are currently in design for several schools for the New Jersey SDA.

Health Care and Hospitals

YAS has provided consulting services for many important hospital and health care facilities, for a variety of public, private and institutional clients. In several of these projects, construction work was performed without interrupting the day-to-day activities of the facility.

Some examples include additions done for the Albert Einstein Medical Center, Montefiore Hospital and Methodist Hospital, among others. We have provided structural design services for notable health and hospital institutions such as the Veteran’s Nursing Home South at Veteran′s Administration Medical Center in Montrose, New York; Veteran′s Administration Medical Center, Pittsburgh, Pennsylvania, an addition alongside the existing hospital; Kings County Hospital Center, Brooklyn, New York, new buildings and renovations; Medical Arts Pavilion at Montefiore Medical Center, Bronx, New York; an addition over the FDR Drive at the Hospital for Special Surgery, New York, New York; an addition the Jacobi Medical Center, Bronx, New York; an addition to the Albert Einstein Medical Center, Bronx, New York; New Medical Research School, University of Rochester, Rochester, New York; Children′s Medical Center, at Montefiore Medical Center, Bronx, New York; the State University of New York, in Buffalo, the New York the Medical Laboratory Building and for the State University of New York located at Stony Brook, New York, the Stony Brook Cancer Center and Stony Brook Heart Center - Phases I, II & III.

A requirement in upgrading buildings is the necessity to improve and/or replace the exterior walls. Notably, we have created new exteriors for the Grand Hyatt Hotel (42nd Street and Lexington Avenue); HBO Headquarters (1100 Avenue of the Americas); International Flavors and Fragrance building (57th Street and 1st Avenue); Park Avenue Court (the former Gimbels Department Store, 86th Street and Lexington Avenue); the exterior of the Trump International Hotel & Tower on Central Park South; Rego Park Shopping Mall, Queens; and Maxwell High School, Brooklyn.

Some of our notable renovation projects include 545 Madison Ave, the State Office Building in Albany, NY and the 85 year old 450 Lexington Avenue Building, a landmark U.S. Post Office situated adjacent to Grand Central Terminal and directly above the railroad tracks. The 450 Lexington project involved adding a 40-story, one million square foot, steel framed office building above and through the existing USPO facility while maintaining the integrity of its landmark spaces.

Other notable projects are the Ed Sullivan Theatre, restored to accommodate the David Letterman T.V. Studio, theatre related facilities and offices. The restoration and rehabilitation of the old B. Altman′s store, now the CUNY graduate center, was a complex undertaking that involved the preservation of old decorative woodwork and other elements. Additional projects worth mentioning include the 34th Street U.S. Post Office, the Chelsea Mercantile Building, the landmark Train Station in Wilmington, Delaware, and "The Garage", a 19th century structure in Cambridge, Massachusetts now used as a shopping mall.

YAS was responsible for the renovation of the Manhattan Family Courthouse at 60 Lafayette Street, the Jacob K. Javits Federal Building at 26 Federal Plaza, and for the structural engineering portion of the seismic upgrade and general renovation design of the old Federal Courthouse at 40 Foley Square in New York City. The project entailed general renovations, restoration of historic elements plus the seismic upgrading necessary for protection of life safety during a seismic event. Our engineers also worked on the $185,000,000 addition and renovation of 80 Center Street New York City′s largest courts facility and the Bronx Hall of Justice, another major court complex including 150 holding cells and extensive parking facilities.

Civil and Transportation

Among the bridge and highway projects designed by YAS are the following: Widening of Long Island Expressway Bridge over Searingtown Road - a 2-span haunched prestressed concrete Box Beams (continuous for Live Load) to match the soffit of the existing rigid frame bridge; the 68th Street and 70th Street Bridges over AMTRAK Riverside Boulevard Bridge, and the 69th Street to 70th Street Riverside South Project; NYSDOT Region 11 seven bridges, Henry Hudson Parkway, 11 bridges, Van Wyck Expressway; Biennial Inspections in 1994, 1995, 1996, and 1997 for the Triborough Bridge & Tunnel Authority (TBTA) and the NYS Thruway and preliminary design of all approach span superstructures for the proposed second Goethals Bridge - Prestressed Concrete "I" Girders continuous for live load.

Seismic Evaluations and Rehabilitations

Ysrael A. Seinuk, P.C. has been involved in seismic evaluation and rehabilitation of numerous projects including the Harlem River Lift Span Bridge consisting of three thru-truss spans and 2 towers in Manhattan. The YAS Earthquake Engineering Section performed a Multi-modal Spectral analysis of the following lift span structures: the 6th and 8th Avenue Bridges over the Long Island Railroad in Brooklyn; the Marine Parkway Bridge Cellular Abutments and the Belt Parkway Bridge over Mill Basin in Queens; the Larchmont Station Plaza and Chatsworth Avenue Bridge in Larchmont, NY; Approach Spans of the second Goethals Bridge over Arthur Kill; Rte 218 and Rte. 17M Highway Bridges in Orange County, NY; the 66th Street, 68th Street and 70th Street Bridges and the Riverside Drive Bridge from 69th Street to 70th Street in Manhattan. Also, YAS has been involved with seismic evaluation of all New Jersey Turnpike bridges.

YAS has also been involved in preliminary and final design for the NYCDEP reconstruction of 12 upstate Watershed bridges. As a subconsultant to Hardesty & Hanover, LLP, YAS is responsible for inspections, load ratings, inspection reports, preparation of contract plans and other final design documents for four (4) bridges (Kensico Spillway Channel, Kisco River, Cross River and Baptist Church Road.

The firm has performed the structural design of buildings and bridges for the Riverside South Apartments spanning active AMTRAK railroad tracks for Trump/New World Project Management at 66th Street, 67th Street, 68th Street, 69th Street and 70th Street and Riverside south from 69th Street to 70th Street.

Blast Engineering

Ysrael A. Seinuk, P.C. has a highly specialized department focusing on blast resistant design and structural security engineering. The YAS background and unsurpassed experience in high rise building structures coupled with our security engineering professionals provides our clients with a high level of expertise. Our Engineers and security professionals have over 30 years of experience in a wide rage of engineering services, including:

YAS provides all its clients with efficient and cost effective design solutions while maintaining the highest level of confidentiality and privacy required in this type of service. The YAS experience base in Blast and Security Engineering is substantial, however due to the confidential nature of this work the names of several of these projects cannot be disclosed. We have been designated as the Project Blast Engineer for the new PATH transportation hub at the World Trade Center site in New York City. Recent experience includes a major structural blast study of a prominent tunnel leading into Manhattan. In addition we participated in the FEMA study of the World Trade Center collapse and co-authored in the preparation of the final report.

The following is a partial listing of clients for whom we have completed blast engineering services:

WTC Path Station; Bronx Hall of Justice; United Nations Development Corporation; Museum of Jewish Heritage; Lawrence Ruben Developers; Port Authority on NY and NJ

Protection against terrorism cannot always be completely successful. Choices made in terms of how risk will be managed in design and construction phases must define a level of protection where the cost of protection relative to the cost of loss is optimized. An economically efficient and robust structure fortified with redundancies, can improve the ability of the building to withstand extreme natural events such as hurricanes and other rare wind effects, seismic activity and foundation movement as well as man made disasters. The use of redundant components as well as structural elements capable of absorbing high amounts of energy as they deform under extreme loads can be a very effective countermeasure in the event of an explosion. Redundancies “bridge over” damaged sections by providing alternative load paths while structural elements and connections with good ductility enable deformation of components without fracturing. The inherent residual strength produced by the use of these techniques reduces the vulnerability to progressive collapse. In addition, the location of elements that are critical to the survival of the structure should be carefully considered and protected from exposure to hazards such as fire or blast-propelled debris. Provisions must also be made for events that may generate forces opposite to normal loads. Uplifts produced by explosions could produce such a phenomenon.

Other preventive measures such as barriers that limit access to the building can play an important role in mitigating the effects of a terrorist attack. Physical barriers at or near the site boundaries provide perimeter protection. Where possible, a buffer zone (stand off) created by placing decorative planters, gates and other obstructions at a distance from the building can reduce the magnitude of blast overpressures. The location, reinforcement and shape of perimeter barriers may also help to deflect the force of propelled material that results from a detonation, away from inhabited areas.

Our firm incorporates and utilizes state of the art blast engineering and simulation software which enables us to clearly compare expanding levels of protection based on a range of potential risks. The damage that will be caused by a pre-determined level of threat can be studied with 3D visualization techniques and are incorporated into our case studies. The application of historical data is used to further clarify options. Ysrael A. Seinuk, P.C. is internationally recognized for its engineering innovations and its contributions to the development of structural security solutions. We have provided these services for commercial developers, government agencies, laboratory and research facilities, corporate properties and institutions.

YAS maintains one workstation for each staff member and two independent network servers utilizing the latest technology for design, analysis and database management together with numerous innovative analysis and design software packages. YAS is capable of producing contract plans in both AutoCad, including REVIT and Prosteel, and MicroStation formats and is able to deliver the projects in any format the client requests.

Acknowledged as the leader in its field and a highly innovative firm, Ysrael A. Seinuk, P.C. approaches all its engineering commissions with the same underlying philosophy -- to work closely with the client, other consultants and the necessary agencies to develop the most creative engineering solution of the highest quality, on-time, and within the economic framework of the project.

Ysrael A. Seinuk, P.C. has established a reputation for excellence. Our capability to provide innovative design, as well as our unique qualifications and acquired experience in civil and structural engineering, places us in the forefront of our profession.