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Users of D/2

Alabama Cemetery Preservation Alliance
Alabama Historical Commission
Architect of the Capital
Colonial Williamsburg Foundation
Department of Veterans Affairs
Frank Lloyd Wright Foundation
Georgia Municipal Cemetery Association
Indiana Department of Natural Resources
National Park Service
Oregon Historical Commission
Smithsonian Institute
Texas Historical Commission

Biltmore Estate
DuPont Estate
Fort at Old San Juan, Puerto Rico
Harper's Ferry
LBJ Library
Mount Vernon
San Juan Capistrano
The Alamo
The White House
U.S. Capitol
U.S. Customs House
U.S. Supreme Court
Vizcaya Mansion
Washington Monument
Watts Towers

Holocaust Museum, DC
Metropolitan Museum of Art, NY
Museum of Natural History, NY
Museum of the American Indian, DC
National Portrait Gallery, DC
New York Public Library, NY

State Capitols
Florida State Capitol
Louisiana State Capitol
Mississippi State Capitol
Montana State Capitol

Columbia University
Dartmouth College
Harvard University
Loyola University
Princeton University
Rice University
Rochester University
Rowan University
U.S. Military Academy at Westpoint
U.S. Navel Academy at Annapolis
University of Maryland
Yale University

All Civil War National Cemeteries
Andrew Johnson National Cemetery
Antietem National Cemetery
Arlington National Cemetery
Congressional Cemetery, DC
Gettysburg National Cemetery
Mount Auburn Cemetery, MA
Natchez National Cemetery
Old Burial Hill, Plymouth, MA
Swan Point Cemetery, RI
Thomas Jefferson Cemetery
Tomb of the Unknown Soldier
Vicksburg National Cemetery
Woodlawn Cemetery, NY

388 Greenwich Street

Kohn Pederson Fox were the architects for Shearson Lehman Plaza, located at 388 Greenwich St. NYC, just a few blocks north of what was then The World Trade Center. It later became the Traveler’s Insurance Building. Now it is being transformed into the new Citigroup Headquarters and a major renovation is taking place. The North and East facades of the 40 story skyscraper have been cleaned with D/2 Biological Solution. The building material is a fairly porous cast stone that that has attracted significant biological growth and air born pollutants. Work was staged from as many as twelve 30’ swing scaffolds. Tishman Construction is overseeing the project. Brisk Waterproofing, a Division of Western Waterproofing was the façade cleaning contractor. Integrated Conservation Resources developed the cleaning specifications and supervised the work. D/2 Biological Solution was supplied by AH Harris.

455 Central Park West

455 Central Park West's restoration was completed in 2005. Built by John Jacob Astor III in 1884 as the New York Cancer Hospital it lay in ruins for more than 25 years until the architectural firms of RKTB and Perkins Eastman were retained to restore and convert it into luxury housing. Jablonski Building Conservation was retained as building conservator and specified D/2 Biological Solution for removal of biological growth from the various facade stone and masonry substrates.

Art Students League

The Art Students League of New York was designed by Henry Hardenbergh and completed in 1892. Other Hardenbergh designed buildings include The Dakota, Plaza Hotel and Willard Hotel. Thomas Eakins and Augustus Saint-Gaudens were founding Board Members. Many of the 20th century's most important artists have studied here including Thomas Hart Benton, Jackson Pollock, Alexander Calder, Helen Frankenthaler, Roy Lichtenstein, Maurice Sendak and Robert Rauschenberg. Joan Berkowitz specified D/2 Biological Solution for the cleaning of the limestone façade.

Biltmore Estate

The Biltmore Estate is the largest private home in America. It was designed by architect Richard Morris Hunt for George Washington Vanderbilt. It took over six years to construct and was completed in 1895. Frederick Law Olmsted designed the 8,000 acres of cultivated landscape. The facades and much of the interior is Indiana Limestone. D/2 Biological Solution has been a significant part of their maintenance cycle for many years.

Burial Hill

On the National Register of Historic Places, Burial Hill in Plymouth, MA, is one of the oldest European cemeteries in America. Many of the original Mayflower Pilgrims are buried here including the first governor, William Bradford and Church Elder, William Brewster.
The project will span four years to be completed prior to the 400th Anniversary in 2020. The work includes conservation and cleaning of more than 2,269 historic stones. D/2 Biological Solution is the specified cleaner.
Stone conservator Ivan Myjer wrote the specification. Monument Conservation Collaborative (MCC) has been engaged to complete the work. A.H. Harris is the D/2 supplier. The Friends of Burial Hill raised the funds for the project through a Plymouth Community Preservation Commission Grant

Congressional Cemetery

During its restoration of the 168 Benjamin Latrobe designed sandstone cenotaphs, the National Park Service chose D/2 to do the cleaning.

Coral Gables City Hall

Coral Gables City Hall was completed in 1928 by architect Phoneas Paist. It is built of local oolitic limestone in the Mediterranean Revival style consistant with the other public buildings of Coral Gables. It is on the National Register of Historic Places. Rosa Lowinger & Associates were hired to restore and conserve the delicate limestone façade. D/2 Biological Solution was used for the cleaning that was completed in July 2015.

Fort Wadsworth

Fort Wadsworth is a former United States military installation on Staten Island in New York City, situated on The Narrows which divide New York Bay into Upper and Lower halves, a natural point for defense of the Upper Bay and Manhattan beyond. Prior to closing in 1994 it claimed to be the longest continually garrisoned military installation in the United States. D/2 was used by a National Trust HOPE Crew to clean stonework at the fort.

Frank Lloyd Wright's Taliesin

Frank Lloyd Wright's Taliesin estate is a shrine to many architects. Staff there use D/2 to combat biological growth.

Heinrich Heine Memorial

The Heinrich Heine Memorial, also known as the Lorelei Fountain was designed and fabricated in Germany for erection in Dusseldorf. It ended up on the Grand Concourse in The Bronx in NYC where it was moved several times and heavily vandalized. In 1999 the Municipal Art Society raised funds for its restoration. D/2 Biological Solution was specified for its cleaning. Joan Berkowitz was the conservator and still gives the fountain a light D/2 maintenance spraying every other year.

Iowa Monument

D/2 has been used to clean thousands of monuments across the country, preserving our history for future generations.

Jefferson Market Library

The Jefferson Market Branch of the New York Public Library was designed by Frederick Clark Withers and Calvert Vaux and completed in 1877. Margot Gayle, EE Cummings and Lewis Mumford lead the effort to save it in the 1960s. Giorgio Cavaglieri was then hired by the NYPL to convert from a courthouse to one of its most unique branches. Mae West was tried for obscenity and Harry K. Thaw was convicted of the murder of Stanford White at the courthouse. More recently, Joan Berkowitz specified D/2 for exterior stone and masonry cleaning in 2010.

MIT Building E52

MIT Building E52 is an Art Deco limestone building dating back to 1938. It was originally built for Lever Brothers and became the MIT Sloan School of Management in the 1950’s. Beyer Blinder Bell Architects was hired to complete the renovation and add a new addition. D/2 was specified to clean biological growth from the limestone facade.

Museum of Science & Industry

There's no job too big for D/2. The ornamented facades of this 400,000 sq ft Chicago Landmark were cleaned from top to bottom with D/2.

Northwestern University Library

Northwestern University Library is a prime example of Chicago Brutalist architecture. It was completed in 1970 and designed by the acclaimed architect Walter Netsch of Skidmore Owens & Merrill. The cast concrete building was cleaned in 2015 using D/2 Biological Solution.

Old San Juan

The city walls of San Juan, Puerto Rico are a part of the San Juan World Heritage Site. The walls were begun in the 1630s with construction continuing for the next 150 years. They average 42 feet in height and are also about 42 feet thick at their base. The National Park Service began cleaning the walls with D/2 Biological Solution more than 8 years ago. The current project includes two distinct sections of the wall known as the Santa Elena and the San Augustin. Together they extend 2,600 feet. The Atlanta office of architects Lord Aeck Sargent have been retained by the NPS to write the cleaning specifications.

Pope-Leighey House

In 1939 journalist Loren Pope and his wife Charlotte Pope commissioned Frank Lloyd Wright to design a new home. The design followed Wright's Usonian principles and was completed in 1941. The "Usonian" house was developed by Wright as a means of providing affordable housing for people of moderate means. Wright employed wood cladding as an affordable and easily workable material into his design. After almost a century, the wood cladding needed some help. That's where D/2 came to the rescue. D/2 is often used to control biological growth on wood subject to moisture and was used here to remove bio growth without harming the sensative historic fabric of this Wright gem.

The Alamo

Texans take the Alamo seriously. So, it's no small thing that they choose D/2 to keep it looking its best.

The White House

The National Park Services trusts D/2 to keep America's iconic White House looking white.

Tomb of the Unknowns

More than 4 million people visit hallowed memorial each year. D/2 is used to keep its Yule Marble looking flawless.

Veterans Administration

D/2 is used by the VA to clean over 3.5 million headstones each year

Vizcaya Museum & Gardens

Vizcaya Museum & Gardens was built in the early 20th century in the Coconut Grove area of Miami Beach. It is a fanciful architectural mixture of various Mediterranean Renaissance styles. Coquina, a soft local sedimentary rock was used for much of its construction. In recent years it has undergone a thorough and extensive restoration. Many notable building conservation firms including Conservation Solutions, Rosa Lowinger & Associates and Simpson Gumpertz & Heger have worked on the restoration. D/2 Biological Solution was used to remove the biological growth.

Yale School of Nursing

The Yale University School of Nursing, is the oldest university school of nursing in the world. To celebrate its 90th anniversary it dedicated its relocation to a newly renovated cast concrete building on the West Campus. Wiss, Janney, Elstner Associates specified D/2 Biological Solution for the cleaning of the cast concrete facade.