The Bronx has a bad rep, whether it’s being the famous poster boy of urban decay, further popularized by the Bronx is Burning comments or being known as the poorest borough in NYC. The truth is, it isn’t all bad! The Boogie Down is home to the best baseball team in history, the beautiful architecture of the Grand Concourse, the largest and third largest parks in NYC (Pelham Bay Park & Van Cortlandt Park, and of course my alma mater Manhattan College University.
Recently, we made a trip to one of the other world-renowned sites in the Bronx. While the kids were more interested in the Dinosaur exhibit, my wife and I found the architectural beauty equally fascinating. In the world of historic preservation and architectural craftsmanship, few sites marry beauty, durability, and scientific mission quite like the Bronx Zoo’s Astor Court. Nestled in the heart of the Bronx and forming the original core of the Wildlife Conservation Society campus, this National Historic District is more than a zoological attraction—it’s a celebration of early 20th-century architectural innovation and particularly the legacy of Guastavino tile vaulting and elaborate ornamental stonework. While many go to the zoo to visit the animals, it’s important to stop and recognize the works of art that make up the buildings on the Zoo’s campus.
The Bronx Zoo opened in 1899, and its original beaux-arts campus, known as Astor Court, was the vision of Heins & LaFarge, a New York-based architectural firm also responsible for the original Cathedral of St. John the Divine and much of the city’s early subway design. Their work at the zoo was built to last—both in form and in function. To execute soaring, fireproof ceilings in the Lion House, Elephant House, and Bird House, they brought in the Guastavino Fireproof Construction Company.
The Guastavino system—a technique of thin-tile vaulting imported from Spain and made famous by Rafael Guastavino and his son—offered unparalleled fire resistance and architectural drama. These self-supporting tile domes and arches made it possible to span large areas with lightweight ceramic materials, often installed without formwork.
Beyond tile vaulting, the Astor Court buildings are celebrated for their extensive use of decorative stonework—much of it executed in limestone, terra cotta, and granite. The façades feature animal-themed carvings integrated into cornices, pediments, keystones, and entablatures. These details weren’t just decorative—they served to visually communicate the zoological function of the buildings.
Highlights include:
- Granite lion heads and elephant keystones adorning the arches of the Lion and Elephant Houses, respectively.
- Terra cotta friezes and capitals depicting reptiles, birds, and foliage, carefully coordinated with the animal groups housed within.
- Classical orders with zoological twists, including Ionic and Corinthian columns topped with stylized acanthus intertwined with animal motifs.
- Bas-relief inscriptions referencing species and scientific classification, emphasizing the educational mission of the institution.
Much of this sculptural work was carried out by the Piccirilli Brothers, renowned stone carvers whose studio also created the marble Abraham Lincoln at the Lincoln Memorial and the lions at the New York Public Library.
While countless people enjoyed the Astor Court area of the zoo, it was not immune to the decay that ran through the Bronx in the 70s, 80s and 90s. Without intervention, the historic value of the buildings could have been lost. Major restoration campaigns in the 2000s brought these elements back to life. Restoration teams faced the challenge of reconciling 19th-century materials and craftsmanship with 21st-century performance expectations. Key aspects of the envelope and façade work included:
- Replacement and Dutchman repairs of terra cotta ornaments using custom-fabricated units and lime-based mortars.
- Repointing of stone joints using historically compatible mixes and joint profiles, in accordance with historic guidelines.
- Integration of modern waterproofing systems—including flashing, , and concealed drainage paths—behind historically accurate roof and wall assemblies.
- Laser scanning and photogrammetry were used to document complex profiles and ensure accurate reproduction of damaged sculptural elements.
Where possible, deteriorated Guastavino tile was removed and replaced using hand-laid techniques by trained masons, adhering to the original patterns and mortar composition.
For those stewarding historic campuses in New York or New England—be they religious, academic, or cultural—the lessons are clear:
- Historic durability doesn’t preclude modern performance—you can upgrade while preserving.
- Engage specialists early—especially when original assemblies involve complex, legacy systems like structural tile vaulting, cast iron elements or decorative stonework.
- Don’t overlook ornament—sculptural elements are not just decorative, they’re integral to a building’s narrative and visual identity.
Whether you manage a landmark structure in Cambridge, MA or Upper Manhattan, understanding the construction heritage and the necessary technical strategies to preserve it will ensure your project stands the test of time—just like the vaulted ceilings and carved lions of Astor Court.
Astor Court is just a part of a much larger list of Guastavino tile masterpieces across the Northeast. For further examples, or if you’d like to visit an example that may be a bit closer to you, check out these famous examples:
- Grand Central Terminal, NYC – The Oyster Bar ceiling is perhaps the most iconic example of Guastavino’s tile work in New York, with interlacing vaulted forms that also serve an acoustic function. If you haven’t had the chance, be sure to visit the Whispering Corners!
- Ellis Island Registry Room, NYC – The iconic vaulted ceiling of the Great Hall was reconstructed with Guastavino tile in the early 20th century after a devastating fire.
- Boston Public Library, Boston, MA – Charles McKim’s Renaissance Revival design includes Guastavino tile vaults throughout its monumental stair halls and reading rooms.
- St. Paul’s Chapel at Columbia University, NYC – A stunning dome vault by Guastavino crowns this early 20th-century ecclesiastical building.
These examples reflect the system’s flexibility and its use in various types of buildings—structures that, like Astor Court, needed to be beautiful and durable.
Principal
Duffy Engineering
