0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONSOLIDATED BALANCE SHEETS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - CONSOLIDATED BALANCE SHEETS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952158 - Statement - CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952159 - Statement - CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952160 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952161 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952162 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Organization link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Recently Issued Accounting Literature link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Revenue Recognition link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Investments in Partially Owned Entities link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Acquisitions link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Identified Intangible Assets and Liabilities link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Redeemable Noncontrolling Interests link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Shareholders' Equity/Partners' Capital link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Stock-based Compensation link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - (Loss) Income Per Share and Per Class A Unit link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - Variable Interest Entities ("VIEs") link:presentationLink link:calculationLink link:definitionLink 9952176 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952177 - Disclosure - Interest and Other Investment Income, Net link:presentationLink link:calculationLink link:definitionLink 9952178 - Disclosure - Interest and Debt Expense link:presentationLink link:calculationLink link:definitionLink 9952179 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952180 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952181 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Revenue Recognition (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Investments in Partially Owned Entities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Identified Intangible Assets and Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Redeemable Noncontrolling Interests (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Shareholders' Equity/Partners' Capital (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Stock-based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - (Loss) Income Per Share and Per Class A Unit (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Interest and Other Investment Income, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Interest and Debt Expense (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Organization (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Revenue Recognition (Schedule of Revenues by Segment) (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Revenue Recognition (Schedule of Components of Lease Revenues) (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Investments in Partially Owned Entities (Fifth Avenue and Times Square JV) (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Investments in Partially Owned Entities (Alexander's Inc.) (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Investments in Partially Owned Entities (7 West 34th Street) (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Investments in Partially Owned Entities (825 Seventh Avenue Office Condominium) (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Investments in Partially Owned Entities (61 Ninth Avenue) (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Investments in Partially Owned Entities (Schedule of Investments) (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Investments in Partially Owned Entities (Schedule of Income (Loss)) (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Identified Intangible Assets and Liabilities (Schedule of Identified Intangible Assets and Intangible Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Identified Intangible Assets and Liabilities (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Debt (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Debt (Schedule of Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Redeemable Noncontrolling Interests (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Redeemable Noncontrolling Interests (Activity of Redeemable Noncontrolling Interests) (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Shareholders' Equity/Partners' Capital (Schedule of Preferred Units) (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Shareholders' Equity/Partners' Capital (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Stock-based Compensation (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Stock-based Compensation (Stock-based Compensation Expense) (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - (Loss) Income Per Share and Per Class A Unit - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - (Loss) Income Per Share and Per Class A Unit - Schedule of Earnings Per Share Basic and Diluted (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Variable Interest Entities ("VIEs") (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Fair Value Measurements (Schedule of Changes in the Fair Value of Deferred Compensation Plan Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Fair Value Measurements (Schedule of Changes in Fair Value of Loans Receivable ) (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Fair Value Measurements (Schedule of Derivative Instruments) (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Fair Value Measurements (Schedule of Carrying Amounts and Fair Value of Financial Instruments) (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Interest and Other Investment Income, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Interest and Debt Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Segment Information (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Segment Information (Schedule of NOI by Segment) (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Segment Information (Schedule of Net Income (Loss) to NOI Reconciliation) (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink