| 1 | Sara Jane | Smythe | The head housekeeper. |
| | Mr. | Birmingham | Sara's employer. |
| | Walter | | One of the porters. |
| | Mabel | | The floor's chambermaid. |
| | Minnie | Camden | Theodore Camden's wife. |
| | Theodore | Camden | An architect. Aka: Theo. |
| | Miss | Morgan | Lula's nanny. |
| | Lula | | Mrs. Camden's daughter. |
| | Luther | | Lula's twin brother. |
| | Edwina | | One of the laundry girls. |
| | Mr. | Douglas | The building's agent. |
| 2 | Mrs. | Ainsworth | A couturier. |
| 3 | Bailey | Camden | An interior designer. |
| | Tristan | | Diego's assistant. |
| | Wanda | | Tristan's friend. |
| | Diego | Crespo | One of the best in interior design. |
| | Lilly-Beth | Latwick | Tristan's acquaintance. |
| | Mrs. Ashfield | Simmons | Tristan's friend. |
| | Rocco | | Bailey's boyfriend. |
| | Melinda | | Bailey's cousin. |
| | Jack | | Bailey's father. |
| | Peggy | | Jack's wife. |
| | Manvel | | Melinda's twin brother. |
| | Sophia | | Melinda's mother. |
| 4 | Edward | Clark | Building owner. |
| | Fitzroy | | The head porter. |
| 5 | Henry | Hardenberg | Mr. Camden's boss. |
| | Daisy | Cavanaugh | One of Sara's assistants. |
| | Mrs. | Haines | One of Sara's assistants. |
| 6 | Lisa | | Melinda's acquaintance. |
| | Tony | | Melinda's boyfriend. |
| | Fred | Osborn | Camden's financial advisor. |
| 7 | Mrs. | Knoblauch | Sara's staff. |
| | Horace | Putnam | One of the tenants. |
| | Mr. | Putnam | A lawyer. |
| | Mr. | Ainsworth | Mrs. Ainsworth's husband. |
| | Richard | Morris-Hunt | An American architect. |
| | Stafford | Rutherford | Owned the biggest house in the neighborhood. |
| | Alma | Rutherford | Stafford's wife. |
| 9 | Christopher | | Bailey's grandfather. |
| | Kenneth | Worley | A butler. |
| | Oscar | | Kenneth's boss. |
| | Lorenzo | Duffy | A building super. Aka: Renzo. |
| 10 | Mr. | Tatum | The head of the New York Yacht Club. |
| 12 | Steve | | The contractor. |
| 13 | Imogen | Cuthberg | Mr. Camden's second cousin. |
| | Emily | | Mr. Camden's daughter. |
| | Miss | Honeycutt | Camden's nanny. |
| 14 | Seamus | | Daisy's brother. |
| | Mr. | Bates | One of the tenants. |
| | Mrs. | Westcott | One of the tenants. |
| 15 | Mr. | Wilton | A judge. |
| | Scotty | | Jack's old friend. |
| 16 | Mr. | O'Connor | One of the elevator operators. |
| | Mickey | | One of Daisy's siblings. |
| 17 | Mr. | Harrington | A judge. |
| | Dr. | Wilde | Mr. Douglas's acquaintance. |
| | Dr. | Fields | The doctor for the insane. |
| | Miss | Garelick | One of the nurses in the asylum. |
| 18 | Mortimer | | Renzo's acquaintance. |
| 19 | Miss | Alden | One of the nurses in the asylum. |
| | Natalia | Fabiano | Sara's friend. |
| | Mr. | Dent | The superintendent in the asylum. |
| | Marianne | | An inmate. |
| 22 | Miss | Cotter | One of the nurses in the asylum. |
| | Nellie | Bly | An undercover journalist. |
| 24 | Mr. | Rogers | The board president. |
| 27 | Lydia | | A retired theater publicist. |
| 28 | Mr. Smith- | Roberts | Mr. Camden's correspondence. |
| | Mr. | Carmichael | Mr. Camden's friend. |
| | Siobhan | | Camden's maid. |
| 29 | Davin | | A new porter. |
| 33 | Eleanor | Rigby | A dog. |
