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Net Income Per Common Share and Net Income Per Common Unit (Tables) | 9 Months Ended
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Sep. 30, 2025
Net Income Per Share and Net Income Per Unit [Line Items] |
Schedule of Net Income Per Common Share | Basic and diluted income per share was calculated as follows for the periods presented ($ in thousands, except per share amounts):
| Three Months Ended September 30,
| 2025 |  | 2024
| Income |  | Weighted- average Common Shares |  | Per Common Share Amount |  | Income |  | Weighted- average Common Shares |  | Per Common Share Amount
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 164,621 |  |  | 64,404,008 |  |  | $ | 2.56 |  |  | $ | 118,424 |  |  | 64,227,662 |  |  | $ | 1.84 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 14,232 |  |  |  |  | — |  |  | 43,797 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 164,621 |  |  | 64,418,240 |  |  | $ | 2.56 |  |  | $ | 118,424 |  |  | 64,271,459 |  |  | $ | 1.84 |
| Nine Months Ended September 30,
| 2025 |  | 2024
| Income |  | Weighted- average Common Shares |  | Per Common Share Amount |  | Income |  | Weighted- average Common Shares |  | Per Common Share Amount
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 589,093 |  |  | 64,368,625 |  |  | $ | 9.15 |  |  | $ | 484,069 |  |  | 64,214,258 |  |  | $ | 7.54 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 23,619 |  |  |  |  | — |  |  | 20,100 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 589,093 |  |  | 64,392,244 |  |  | $ | 9.15 |  |  | $ | 484,069 |  |  | 64,234,358 |  |  | $ | 7.54 |
Essex Portfolio, L.P. |
Net Income Per Share and Net Income Per Unit [Line Items] |
Schedule of Net Income Per Common Share | Basic and diluted income per unit was calculated as follows for the periods presented ($ in thousands, except per unit amounts):
| Three Months Ended September 30,
| 2025 |  | 2024
| Income |  | Weighted- average Common Units |  | Per Common Unit Amount |  | Income |  | Weighted- average Common Units |  | Per Common Unit Amount
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 170,388 |  |  | 66,660,423 |  |  | $ | 2.56 |  |  | $ | 122,630 |  |  | 66,508,041 |  |  | $ | 1.84 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 14,232 |  |  |  |  | — |  |  | 43,797 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 170,388 |  |  | 66,674,655 |  |  | $ | 2.56 |  |  | $ | 122,630 |  |  | 66,551,838 |  |  | $ | 1.84 |
| Nine Months Ended September 30,
| 2025 |  | 2024
| Income |  | Weighted- average Common Units |  | Per Common Unit Amount |  | Income |  | Weighted- average Common Units |  | Per Common Unit Amount
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 609,920 |  |  | 66,643,952 |  |  | $ | 9.15 |  |  | $ | 501,144 |  |  | 66,480,312 |  |  | $ | 7.54 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock options | — |  |  | 23,619 |  |  |  |  | — |  |  | 20,100 |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders | $ | 609,920 |  |  | 66,667,571 |  |  | $ | 9.15 |  |  | $ | 501,144 |  |  | 66,500,412 |  |  | $ | 7.54 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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