903 Park Avenue is a 17-story residential building on Park Avenue on the Upper East Side of Manhattan, New York City.

The building is located on the corner of 903 Park Avenue (where the main entrance is) and East 79th Street.

[2] At the time of its construction, 903 Park Ave was said to be the tallest residential building in New York City.

[2] Physician and railroad investor William Seward Webb was an early tenant.

[2] In 1916, the widow and son of financial investor Norman B. Ream were also tenants.