Harry F. Sinclair House is a house in New York City, New York. Built in 1899, it was designed by C. P. H. Gilbert, and is a National Historic Landmark. It is owned by Ukrainian Institute of America.
Location: Upper East Side, New York City, New York, United States
Verified facts
- Located in Upper East Side, New York City
confidence 90/100 · 4 independent sources · SRC-2486, SRC-2487, SRC-7650, SRC-7651 - Designed by C. P. H. Gilbert
confidence 80/100 · 4 independent sources · SRC-2486, SRC-2488, SRC-7650, SRC-7652 - Built in 1899
confidence 75/100 · 3 independent sources · SRC-2486, SRC-2487, SRC-7650 - Historic designation: National Historic Landmark
confidence 75/100 · 3 independent sources · SRC-2486, SRC-2487, SRC-7651 - Owned by Ukrainian Institute of America (as of 2026-06-05)
confidence 90/100 · 4 independent sources · SRC-2486, SRC-2487, SRC-7651, SRC-7650
Evidence & sources
- SRC-2486 — Wikipedia — Harry F. Sinclair House (Tier 3, encyclopedia; retrieved June 2026)
- SRC-2487 — New York Landmarks Conservancy — Ukrainian Institute of America (Tier 2, institutional_page; retrieved June 2026)
- SRC-2488 — Daytonian in Manhattan — The Isaac D. Fletcher Mansion (Tier 3, established_blog; retrieved June 2026)
- SRC-7650 — National Park Service – NHL/NRHP Nomination Form, Harry F. Sinclair House (NRHP #78001882) (Tier 1, official; retrieved June 2026)
- SRC-7651 — Ukrainian Institute of America – About Us (official site) (Tier 1, official; retrieved June 2026)
- SRC-7652 — NYC-ARTS – Ukrainian Institute of America / Fletcher-Sinclair Mansion (Tier 2, reference; retrieved June 2026)
How we verify
Every fact above is independently corroborated by at least two reputable sources and
confidence-scored before publication. Claims that cannot clear that bar are withheld. We show the
street address only for non-residential public landmarks (museums, commercial and civic buildings,
publicly documented filming-location sites); the exact addresses of private residences and any
personal information are structurally barred from publication. Last reviewed June 2026.