Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	3 Months Ended
Mar. 31, 2026
Noncontrolling Interest [Line Items]
Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	Noncontrolling Interests on the Company’s Consolidated Financial Statements Common Units of the Operating Partnership The Company owned an approximate 99.0% and 99.1% common general partnership interest in the Operating Partnership as of March 31, 2026 and December 31, 2025, respectively. The remaining approximate 1.0% and 0.9% common limited partnership interest as of March 31, 2026 and December 31, 2025, respectively, was owned by non-affiliated investors in the form of noncontrolling common units. There were 1,133,562 common units outstanding held by these investors as of March 31, 2026 and December 31, 2025. The noncontrolling common units may be redeemed by unitholders for cash. Except under certain circumstances, we, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. If satisfied in cash, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $0.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable redemption date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $32.4 million and $43.2 million as of March 31, 2026 and December 31, 2025, respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is generally expected that each common unit would be entitled to a liquidating distribution equal to the liquidating distribution payable in respect of each share of the Company’s common stock. Noncontrolling Interest in Consolidated Property Partnerships Refer to Note 7 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements” for additional information regarding these Consolidated Property Partnerships.
Kilroy Realty L.P.
Noncontrolling Interest [Line Items]
Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements	Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements Consolidated Property Partnerships On February 20, 2026, the Company entered into an agreement with an unaffiliated third party and formed a new consolidated subsidiary. In connection with this formation, we acquired an approximately 1.1-acre land parcel for the future development project at 1900 Broadway in Redwood City, CA for $36.0 million, of which our joint venture partner contributed $9.0 million. We plan to develop an approximately 251,000-square-foot office project in Redwood City, California. At formation, the Company contributed $34.6 million in cash and has committed to contribute an additional $250.0 million to $270.0 million for an estimated ownership percentage of 97.4% upon completion. The related assets, liabilities, and noncontrolling interest recognized in connection with this transaction are included in the consolidated financial statements as of the date of formation. The noncontrolling equity interest was $9.0 million as of March 31, 2026.

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements

3 Months Ended

Mar. 31, 2026

Noncontrolling Interest [Line Items]

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements

Noncontrolling Interests on the Company’s Consolidated Financial Statements

Common Units of the Operating Partnership

The Company owned an approximate 99.0% and 99.1% common general partnership interest in the Operating Partnership as of March 31, 2026 and December 31, 2025, respectively. The remaining approximate 1.0% and 0.9% common limited partnership interest as of March 31, 2026 and December 31, 2025, respectively, was owned by non-affiliated investors in the form of noncontrolling common units. There were 1,133,562 common units outstanding held by these investors as of March 31, 2026 and December 31, 2025.

The noncontrolling common units may be redeemed by unitholders for cash. Except under certain circumstances, we, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. If satisfied in cash, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $0.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable redemption date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $32.4 million and $43.2 million as of March 31, 2026 and December 31, 2025, respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is generally expected that each common unit would be entitled to a liquidating distribution equal to the liquidating distribution

payable in respect of each share of the Company’s common stock.

Noncontrolling Interest in Consolidated Property Partnerships

Refer to Note 7 “Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements” for additional information regarding these Consolidated Property Partnerships.

Kilroy Realty L.P.

Noncontrolling Interest [Line Items]

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements

Consolidated Property Partnerships

On February 20, 2026, the Company entered into an agreement with an unaffiliated third party and formed a new consolidated subsidiary. In connection with this formation, we acquired an approximately 1.1-acre land parcel for the future development project at 1900 Broadway in Redwood City, CA for $36.0 million, of which our joint venture partner contributed $9.0 million. We plan to develop an approximately 251,000-square-foot office project in Redwood City, California. At formation, the Company contributed $34.6 million in cash and has committed to contribute an additional $250.0 million to $270.0 million for an estimated ownership percentage of 97.4% upon completion. The related assets, liabilities, and noncontrolling interest recognized in connection with this transaction are included in the consolidated financial statements as of the date of formation. The noncontrolling equity interest was $9.0 million as of March 31, 2026.