452 Fifth Avenue

452 Fifth Avenue

Company type	Office building
Industry	Commercial real estate
Predecessor	Knox Building
Founded	1985 (1985)
Founder	Attia & Perkins (architects)
Fate	Ownership changes, HSBC departure in 2022
Headquarters	New York City , United States
Area served	Midtown Manhattan
Key people	Eli Attia (lead partner, architect)
Products	Office space
Owner	Property & Building Corporation (subsidiary of IDB Group and Midtown Equities)

452 Fifth Avenue—also referred to as the HSBC Tower and 10 Bryant Park and previously known as the Republic National Bank Building—is a 30-story office high-rise situated at the intersection of Fifth Avenue and 40th Street in Midtown Manhattan, New York City. Completed in 1985 and crafted by the architectural firm Attia & Perkins, the building is distinguished by its glass exterior that elegantly curves around the historic 10-story Knox Building at its base. The Knox Building, an office edifice designed in the Beaux-Arts style by John H. Duncan in 1902, retains its original limestone facade, cornice, and mansard roof. It holds the status of a New York City landmark and is also listed on the National Register of Historic Places.

Initially constructed for Edward M. Knox of the Knox Hat Company, the Knox Building was leased to various commercial tenants over time. In 1964, ownership transferred to the founders of the Republic National Bank of New York, who established their headquarters within it. Throughout the 1970s, the bank acquired neighboring parcels and commissioned Attia & Perkins to design a new tower enveloping the Knox Building to serve as its global headquarters. This tower underwent expansion during the 1990s before being sold to investment bank HSBC. In October 2009, HSBC Holdings divested the property to Midtown Equities alongside Israeli holding company IDB Group, which assigned ownership to its subsidiary Property & Building Corporation (PBC). HSBC continued leasing space there until announcing its departure in 2022.

Site

Situated on the west side of Fifth Avenue between 39th and 40th Streets within Midtown Manhattan, New York City, 452 Fifth Avenue occupies an L-shaped parcel featuring a frontage along Fifth Avenue, a depth of , and encompassing an area of . This building marks the eastern terminus of a masonry row along 40th Street between Fifth and Sixth Avenue, adjacent to Bryant Park. Nearby notable structures include the Engineering Societies' Building, Engineers' Club Building, American Radiator Building, Bryant Park Studios, the New York Public Library Main Branch, and the Lord & Taylor Building.

The northeastern corner contains the Knox Building at Fifth Avenue and 40th Street, originally occupying an lot. This structure replaced the mid-19th century residence owned by Lawrence Kip. Early twentieth-century development along Fifth Avenue north of 34th Street saw brownstone homes replaced by commercial constructions such as the B. Altman and Company Building, Tiffany and Company Building, Gorham Building, and Lord & Taylor Building.

The contemporary skyscraper also incorporates the former Kress Building located at Fifth Avenue and 39th Street, erected in the mid-1930s showcasing an Art Deco design. Additionally, an annex on 20 West 40th Street replaced the Willkie Memorial Building from 1905, originally designed by Henry Janeway Hardenbergh.

Architecture

The structure at 452 Fifth Avenue, once known as the Republic National Bank Building, consists of four distinct components. The ten-story Knox Building, positioned at the southwest corner of Fifth Avenue and 40th Street, was designed in the Beaux-Arts style by John H. Duncan. Adjacent to it stands the HSBC Tower—formerly Republic National Bank Tower—occupying much of the site and designed by Attia & Perkins with Eli Attia as lead partner. The complex also integrates both the Kress Building and another edifice on 39th Street. The entire building reaches a height of , encompassing 30 floors.

The Knox Building is recognized on the National Register of Historic Places and enjoys protection as a city landmark under the authority of the New York City Landmarks Preservation Commission (LPC). Conversely, despite its historical presence, the Kress Building does not hold LPC designation due to a lack of sufficient architectural distinction.

Knox Building

The facade of the Knox Building remains largely faithful to its initial architectural concept. Along Fifth Avenue, the lower six stories are faced with rusticated limestone blocks, while on 40th Street, the third through sixth floors are finished with buff-colored brick rather than limestone. The ground floor contains display windows, with an iron-and-glass canopy sheltering the entrance on Fifth Avenue. Above the first floor once sat a mezzanine level, capped by a modestly adorned cornice. On the second story, arched windows on 40th Street are topped with keyed stone blocks, whereas the rectangular window facing Fifth Avenue is decorated with a palm frond and a female visage.

From the third to eighth floors, the window surrounds are richly ornamented. Floors three through six exhibit a uniform window arrangement: three windows per floor along Fifth Avenue and eight on 40th Street, bordered by quoins at the edges of the facade. A cornice featuring dentils and substantial console brackets sits above the sixth story; however, its metal railing has since been removed. The seventh and eighth floors display windows set within vertical brick piers and horizontal decorative spandrels, embellished with lions’ heads and cartouches on both Fifth Avenue and the terminal bays of 40th Street. The eighth floor is topped by a bracketed cornice.

Crowning the structure is a double-height mansard roof punctuated by dormer windows. The central dormer on Fifth Avenue is a prominent two-story opening crowned by a gable containing a female head, flanked by single-story dormers at the ninth level. On 40th Street, the outer bays feature two-story dormers; inner bays include single-story dormers at the ninth floor alongside three broad openings with nine slender vertical glass panes on the tenth floor. The mansard’s cresting incorporates torch motifs and anthemia adorned with eagles. Originally, both the southern and western elevations were constructed as brick party walls.

HSBC Tower

The HSBC Tower presents a glass exterior, characterized by a distinctive northern elevation that curves around the Knox Building in stepped tiers, resulting in an uneven roofline. Its eastern facade along Fifth Avenue is tinted bronze to blend seamlessly with adjacent structures, while the northern side on 40th Street employs full-height glass panels reinforced with silicone in a green hue to complement the Knox Building’s aesthetic. This facade omits external vertical mullions, instead utilizing internal glass mullions and structural silicone to anchor it to each floor slab. Prior to installation, a two-story prototype was fabricated in Florida.

Positioned 10 feet behind the original building’s street-facing facades, HSBC Tower stands distinctly separate from the Knox Building’s mansard roofline. There were initial plans for an identical tower across Fifth Avenue, but these were never executed.

The tower extends over the Kress Building located at the site’s southeastern corner via cantilevered support beams measuring 25 feet in length that run from the 11th floor up to the roof level. The Kress Building’s original black marble and limestone exterior was completely replaced with granite cladding in rose, beige, and gray tones arranged in a stepped pattern ascending from north to south. Additionally, a new glass facade was introduced at street level. Original ornamental features were removed during construction and placed into storage.

Interior

The floor plates within 452 Fifth Avenue's buildings vary in size, allowing the original occupant, Republic National Bank, to centralize multiple departments across different levels. Upon completion, the entire building encompassed , with the tower itself accounting for .

Beneath ground level, bank vaults extend downwards, occupying . The lobby facing 40th Street boasts a double-height glazed facade accompanied by an entrance canopy stretching , finished with stone and glass materials. A dedicated banking area on Fifth Avenue, designed for swift deposits and transactions, covers and features lighting fixtures including a globe-shaped chandelier crafted by Attia Architects.

The base of the HSBC Tower consists of eight lower stories, each approximately , interconnected by glass walkways to the neighboring Knox Building, forming bridge-like connections. The Kress Building, originally eight stories tall, was augmented by two additional floors topped with a rooftop terrace; these new levels accommodated a versatile trading floor capable of seating 260 individuals, ranking among the city's largest at that time.

On the 11th floor resides an executive dining room adorned with artwork from Republic National Bank’s collection alongside original and replicated paneling sourced from the Knox Building’s banking hall. The serving counters were repurposed from green marble countertops originally found in the Knox Building. Floors above the 12th each measure . Initially, floors 27 through 29 were designed as executive suites but were partially converted into operational offices to support Republic National Bank's rapid growth during the late 1980s.

Original structure

The Knox Hat Company was established in 1838 on Fulton Street in Lower Manhattan by Charles Knox. The firm built a strong clientele before the American Civil War and became renowned for producing high-quality hats. Following the war, leadership passed to Charles Knox’s son, Edward M. Knox. By the end of the 19th century, Knox expanded retail locations throughout Manhattan’s upscale neighborhoods; by 1900, the brand had gained international recognition.

Construction and early years

In 1901, Edward Knox purchased the Kip mansion located at Fifth Avenue and 40th Street, directly opposite what would become the New York Public Library Main Branch. Although acquired through Central Realty, Bond and Trust Company, this was done on Knox’s behalf. He paid $450,000 for the property and commissioned John Duncan to renovate and enlarge the mansion for commercial purposes. By May 1901, plans were submitted for a new ten-story structure.

The Knox Building was completed in October 1902 and featured a flagship Knox hat store with luxurious details such as carved walnut woodwork, bronze-and-marble counters, chandeliers, and gold-plated cabinetry. A mezzanine gallery provided views over three sides of the retail space. Within six months of opening, it was recognized as a prominent attraction on Fifth Avenue. In 1903, manufacturing and retail functions were separated; both companies maintained headquarters in this building while leasing office space to additional tenants.

By 1914, the building was valued at $860,000. Occupants during this era included photographer Percy D. Brewster, retailer Louise Lewis, Town Topics Publishing Company, architect George K. Thompson’s office, and briefly the Republican National Committee in 1918 before they relocated after eighteen months.

Mid-20th century

By the early 1920s, discussions had begun to lease the Knox Building, then under the ownership of the Farmers' Loan and Trust Company. During this period, Benjamin Mordecai and E. Clifford Potter established the Fortieth Street and Fifth Avenue Corporation. After securing the leasehold, they undertook significant renovations of the property. In January 1922, August Heckscher acquired the leasehold for $2 million. By 1923, Heckscher’s portfolio included eleven major office buildings in Midtown, among them the Knox Building, with a combined value estimated at $30 million.

Throughout the 1920s, tenants such as the Gates-Browne Corporation, Arthur S. Kane Picture Corporation, and perfumers Yardley & Co. occupied space within the building. In 1928, the Knox Hat Company renewed its lease for the ground-floor retail area and basement, achieving a record rental rate for a Fifth Avenue corner storefront. Albert B. Ashforth took over leasing responsibilities in 1935; that same year, Knox Hat expanded its presence by adding space on the second floor. Other lessees during the 1930s included Brown & Wells Inc., Julian Inc. hairdressers, and publishers Parfumerie St. Denis Inc. and House of Peters Inc.

In 1964, ownership transferred from the Knox family heirs to a consortium led by Martin Ackerman. The new proprietors applied to establish the Republic National Bank of New York headquarters within the Knox Building. Renovations overseen by Kahn & Jacobs and carried out by Joseph P. Blitz Company were finalized by 1965. The building’s exterior was mostly preserved to retain its architectural integrity, with only minor window updates and replacement of ornamental piers on 40th Street with rusticated ones. The bank officially opened in January 1966 during an event attended by U.S. Senator Robert F. Kennedy.

Tower development

Beginning around 1970 and spanning approximately eleven years, Republic Bank consolidated a parcel of land along Fifth Avenue between 39th and 40th Streets. This assemblage included the Kress Building plus two additional structures situated between the Kress and Knox buildings. The S. H. Kress store, which had operated for over four decades, ceased operations in 1977.

Construction

In 1974, an eleven-story annex to the Republic National Bank Building on Fifth Avenue received approval from the New York City Planning Commission; its design was intended to complement the landmarked New York Public Library Main Branch nearby. By the late 1970s, Republic planned to erect a global headquarters tower on this site to consolidate functions currently spread across fifteen locations throughout New York City. During construction, six buildings along Fifth Avenue—including the Knox Building—were required to remain functional. The bank also aimed to preserve the architectural prominence of the Knox Building.

In 1978, Republic engaged several firms including Kohn Pedersen Fox to develop designs for the tower project. The Knox Building was designated as a city landmark in 1980; although Republic initially opposed this designation due to potential restrictions on design modifications, it subsequently supported landmark status. By mid-1981, plans were still under review following rejection of a proposed mirror-image tower on an adjacent site. In September 1981, Attia Architects unveiled plans for a 27-story tower that would envelop the Knox Building—an undertaking set to become the largest development on Fifth Avenue south of 42nd Street since the Empire State Building’s construction. The Knox Building was listed on the National Register of Historic Places in 1982. In 1983, Republic added two additional floors without raising the overall roofline.

Turner Construction acted as general contractor for this project, collaborating with various architects and consultants. Platt and Byard undertook restoration work on the Knox Building, reinstating original design features such as ground-floor storefront windows and upper-level windows that had been replaced in earlier decades. The interior underwent complete reconstruction. The Kress Building’s façade was replaced and refurbished in phases due to tenant occupancy until mid-1984.

Dispute arose when Republic demolished the Willkie Memorial Building (previously home to Freedom House) at 20 West 40th Street; its decorative elements were removed while it was being considered for landmark status before ultimately being razed.

Completion and expansion

The Republic National Bank Tower reached completion by the end of 1985, with construction costs estimated at around $100 million. Initially, the bank intended to occupy only floors one through seven, while temporarily leasing floors eight to eleven; however, it eventually leased those upper floors as well. Tenants such as the Federal Deposit Insurance Corporation, Aetna, Krungthai Bank, and Hewitt Associates occupied the 12th floor and above. Floors 25 through 28 remained vacant, with the topmost floor reserved as an executive penthouse. Retail space on the ground and mezzanine levels was leased to The Limited. Although the tower was designed to accommodate 1,200 Republic employees, by the end of the decade the workforce had expanded to 2,000. By the early 1990s, Republic was leasing additional office space nearby.

Between 1989 and 1990, Fox & Fowle proposed constructing a 12-story building adjacent to the tower at 20 West 40th Street, but Republic deemed it too small and declined. In September 1993, Republic submitted a plan for a larger 16-story annex featuring a limestone facade topped with a pyramidal roof. As part of this proposal, Republic offered to restore the Knox Building’s Fifth Avenue entrance marquee and seventh-floor railing. Despite initial resistance from Manhattan Community Board 5, approval was granted after Republic highlighted that the project would generate 500 jobs. Because of its proximity to landmarked structures, the addition required approval from the Landmarks Preservation Commission (LPC). After modifications—including changing the facade material to brick—the LPC approved the plan in November 1993. The City Planning Commission also authorized a waiver permitting four extra stories (approximately ) in exchange for preserving elements of the Knox Building.

In May 1994, Mayor Rudy Giuliani provided financial incentives to support construction of the annex, including $6.4 million in waived city and state sales taxes and bonds backing both the $55 million annex project and a $23 million renovation of a data center at 1 West 39th Street. This package encouraged Republic to maintain its data center in New York instead of relocating staff to New Jersey. Giuliani’s administration also permitted foundation work to commence prior to completing the Uniform Land Use Review Procedure. Although all approvals were finalized by mid-1994, development on the site stalled; it remained a parking lot until its transformation into the condominium complex The Bryant in the late 2010s.

The data center expansion doubled electrical capacity by adding an extra 4,000 amperes. The upgrade involved retrofitting a neighboring 1920s building on 39th Street; four rooftop water tanks were removed to make room for a generator and switching equipment. Loading docks were modernized and new electrical conduits installed beneath the street—all completed with minimal disruption during winter excavation constraints. This renovation wrapped up in the late 1990s. In 1998, electronics retailer Tops Appliance City leased space on both the ground and second floors of the tower.

2000s and 2010s

In 1999, HSBC acquired Republic National Bank. HSBC Brokerage expanded its presence at 452 Fifth Avenue in 2002 by establishing the HSBC Brokerage Center. In September 2008, HSBC contemplated selling the property but withdrew after offers between $400 million and $500 million failed to meet its $600 million asking price. By April 2009, HSBC revisited plans to sell, receiving approximately twenty bids ranging from $250 million to $300 million—still below their target range of $400 million to $500 million. Ultimately, in October 2009, HSBC Holdings sold the building for $352.9 million to Midtown Equities and Israeli holding company IDB Group; they planned a one-year leaseback for the entire building and a ten-year lease for its first eleven floors. Ownership was transferred by IDB to its subsidiary Property & Building Corporation (PBC).

This transaction coincided with a real estate upswing around Bryant Park. Historically, rental rates south of 42nd Street—including at 452 Fifth Avenue—were lower than those north of it; PBC aimed to renovate the building to command higher rents. Renovations commenced in 2010 under PBDW Architects, who restored original decorative features from the Knox Building. The lobby renovation was completed in 2011; subsequent work included replacing elevators and upgrading mechanical systems. By late 2012, most refurbishment phases were finished, and within eight months PBC had leased fourteen out of eighteen available floors primarily to law firms and financial institutions.

In mid-2012, PBC refinanced with $300 million in commercial mortgage-backed securities issued by JPMorgan Chase, valuing the property at approximately $670 million. Asking rents surpassed $100 per square foot by 2013, placing 452 Fifth Avenue among New York City's premium office locations. By mid-2015, occupancy reached full capacity amid speculation that PBC might put it on the market. That year, JLL was appointed as leasing agent. HSBC extended its lease for an additional five years in 2017 after exploring alternative options.

2020s to present

In October 2021, PBC revealed its intention to divest 452 Fifth Avenue and channel the capital into real estate holdings in Israel. By December, Innovo Property Group’s Andrew Chung agreed to purchase the property for $855 million, with the transaction initially slated for completion in May 2022. Nevertheless, HSBC's announcement to move to The Spiral at Hudson Yards by January 2024 led Chung to relinquish a $30 million deposit after failing to obtain $200 million in financing by the deadline. Consequently, the agreement fell through shortly thereafter, with PBC retaining the deposit and refinancing the asset through a $385 million loan from JPMorgan Chase. The building was later renamed 10 Bryant Park.

In February 2023, PBC made another attempt to sell the property but did not succeed, despite new leases signed by tenants such as HBK Capital Management and Novartis. Later that year, JPMorgan Chase sought to offload its loan associated with the building. By March 2024, Discount Investment Corporation, PBC’s parent company, declared plans to retire $400 million in debt via bond issuance. In May, PBC settled the loan using $385 million raised on the Tel Aviv Stock Exchange and announced forthcoming renovations for 452 Fifth Avenue.

In April 2025, Amazon secured a lease for nine floors within 452 Fifth Avenue, occupying part of the space formerly held by HSBC.

Critical reception

Architectural historians Norval White and Elliot Willensky described the Knox Building in the AIA Guide to New York City as an "exuberant Classical showcase" constructed for Colonel Edward Knox, a hat maker to Presidents. Following the opening of Republic National Bank offices there in the 1960s, architecture critic Ada Louise Huxtable lauded its "beautifully restored" design that harmonizes with the New York Public Library Main Branch, characterizing the interiors as reminiscent of a "Beirut Louis XVI atmosphere."

While Republic National Bank Tower was under construction, Paul Goldberger praised the Knox Building as a "lyrical classical gem" but critiqued how the tower "overpowers the old building, reducing this strong classical structure to a quaint little toy." When a second annex was added during the 1990s, Peter Slatin observed that the original tower exemplified an architectural approach now largely abandoned—one that deliberately distinguishes new construction from historic surroundings. In 2010, architectural historian Christopher Gray remarked that the Knox Building "renders the opulent New York Public Library [main building] almost modest by comparison."

See also

• List of tallest buildings in New York City
• List of New York City Designated Landmarks in Manhattan from 14th to 59th Streets
• National Register of Historic Places listings in Manhattan from 14th to 59th Streets