New York City

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.

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.

New York Public Library

The New York Public Library's landmarked Fifth Avenue building was designed by architects Carrère and Hastings in 1897 and completed in 1911. In celebration of the iconic building's 100th anniversary, it was given a facelift with D/2, washing away years of dirt and grime.

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.

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.