- Year built
- 1924
- Type
- Cooperative
- Units
- 10
- Floors
- 14
- Landmark
- Designated
- Pets
- Permitted
898 Park Avenue is among the most architecturally distinctive boutique pre-war cooperatives on the Lenox Hill / Carnegie Hill seam of Park Avenue and a structurally exceptional commission within the broader 1920s Park Avenue building cycle. Designed in 1924 by John Sloan and Albert Nast ("Sloan & Nast") for developer Henry Mandel's Mandel-Ehrich Corporation, the 14-story building was originally configured as 6 duplex apartments plus a grand ballroom — an unusual configuration that distinguished 898 Park sharply from the conventional Park Avenue cooperative apartment-house tradition. The 1953 cooperative conversion and subsequent subdivisions produced the current 10-apartment configuration.
The architectural register is structurally distinctive. The yellow- and brown-pitted brick masonry façade is articulated by brightly colored terracotta decoration — an architectural composition that places 898 Park outside the broader Italian Renaissance / Georgian house style that dominated the 1920s Park Avenue residential mainline. The result is one of the architecturally most distinctive small-scale pre-war cooperatives on the corridor.
John Sloan would later design 895 Park Avenue (1929) — across the avenue from 898 Park — producing a structural architectural pairing of two Sloan-designed buildings on the same Park Avenue intersection. Developer Henry Mandel was one of the larger speculative apartment-house developers of the 1920s; his career would later be financially ruined by the Depression.
The building's defining structural feature is its private elevator entry to each apartment — a configuration uncommon on Park Avenue and a function of the original 6-duplex plan. The 10-apartment intimate scale produces a cooperative culture calibrated to the boutique pre-war tradition.
The building's most consequential recent transactional history is documented in The Real Deal's August 2021 reporting: Valerie Mnuchin (sister of Steven Mnuchin) sold the triplex penthouse for $7,700,000 on August 9, 2021, having acquired the configuration in 2014 at $8,400,000. The marketing process produced a buyer dispute and litigation; Mnuchin sued the buyers over approximately $1 million in deposits. The penthouse — configured at approximately 4,100 square feet with a wraparound terrace — is currently relisted at approximately $8,950,000 through Brown Harris Stevens, restructured to a 4-bedroom, 5.5-bathroom configuration from the prior 7-bedroom layout.
Architecture and unit composition
The 10 cooperative apartments distribute across the building's 14 stories. The original 6-duplex configuration produced the structural architectural feature of private elevator entry to each apartment; subsequent subdivisions have produced the current apartment inventory while preserving the broader configuration framework. Apartment layouts carry the architectural fabric characteristic of Sloan & Nast's 1924 design — substantial ceiling heights, formal entry arrangements, and the architectural finish specifications of pre-Depression Park Avenue luxury construction.
The triplex penthouse — approximately 4,100 square feet with a wraparound terrace — is the building's structural apex apartment.
Building operations
898 Park operates as a small-scale full-service cooperative with full-time doorman and full-time live-in superintendent. The amenity infrastructure includes elevator service to each apartment and laundry and storage facilities in the basement. The building does not carry an on-site garage.
The cooperative policy framework — pet-friendly, pied-à-terre permitted — is notably flexible by Park Avenue cooperative standards. Specific financing maximum, flip tax structure, and sublet duration limits should be verified directly with management.
What to know if you’re buying
The Sloan & Nast architectural pedigree is structurally distinctive. The 1920s yellow-and-brown brick masonry with terracotta detailing is outside the Italian Renaissance / Georgian house style that defined the 1920s Park Avenue mainline; the architectural composition is structurally distinguishing.
The original 6-duplex configuration produces structural apartment-level features. Private elevator entry to each apartment is uncommon on Park Avenue and a function of the original architectural plan.
The 10-unit boutique scale produces a specific cooperative culture. Among the smallest cooperatives on the Park Avenue corridor.
Pied-à-terre and pet policies are flexible by Park Avenue standards. Materially more accommodating than typical Park Avenue cooperative norms.
The recent transactional history is part of the building's contemporary market context. The 2021 Mnuchin penthouse transaction and the subsequent litigation history are documented in trade press; sophisticated buyers will research this history themselves.
Verify operational specifics during due diligence. Specific board approval framework, financing structure, sublet duration limits, current capital project pipeline, and the LL11 façade cycle on the 1924 vintage should be reviewed.
Closing timelines are cooperative-standard. Plan for 6–10 weeks from contract through board approval to closing.
What to know if you’re selling
Marketing should emphasize the architectural distinctiveness and the boutique scale. Both are structural identity features.
The triplex penthouse occupies its own pricing category. Apartment-level comparable analysis on the 10-unit scale requires close attention to the specific configuration variation.
Closing timelines are cooperative-standard.
Comparable buildings
If you're considering 898 Park Avenue, also evaluate:
- 895 Park Avenue — John Sloan 1929; same-architect Park Avenue peer across the avenue
- 888 Park Avenue — Schwartz & Gross 1925–26; immediate Park Avenue Historic District peer
- 940 Park Avenue — pre-war Park Avenue peer
- 778 Park Avenue — Candela 1931; pre-war Park Avenue trophy peer
- 998 Fifth Avenue — McKim, Mead & White 1912; pre-WWI Fifth Avenue trophy peer
The Roebling Team at 898 Park
The Roebling Team at Compass specializes in Central Park West, the Upper East Side, and the broader Park-facing Manhattan market. We publish this building profile because Park Avenue Lenox Hill / Carnegie Hill seam buyers and sellers deserve building-specific intelligence — architectural attribution, board context, and pricing at the apartment level.
If you're considering a purchase or sale at 898 Park, a 30-minute consultation is the right starting point.