**Exhibit 31.1**

# **CERTIFICATION**

**RECKSON OPERATING PARTNERSHIP, L. P.**Certification of Marc Holliday, President of RecksonAssociates Realty Corp., the sole general partner of the Company’s, Pursuant toRule 13a - 14(a)/15(d) - 14(a)

**I, MarcHolliday, certify that:**
|        | 1.     | I have reviewed this quarterly report on Form 10-Q  of Reckson Operating Partnership, L.P. (the “Company”);                                                                                                                                                                                                                                                                                |
|--------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|   | 2.     | Based on my knowledge, this report does not contain  any untrue statement of a material fact or omit to state a material fact  necessary to make the statements made, in light of the circumstances under  which such statements were made, not misleading with respect to the period  covered by this report;                                                                                       |
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|   | 3.     | Based on my knowledge, the financial statements, and  other financial information included in this report, fairly present in all  material respects the financial condition, results of operations and cash  flows of the Company as of, and for, the periods presented in this report;                                                                                                              |
|   |   |                                                                                                                                                                                                                                                                                                                                                                                                 |
|   | 4.     | The Company’s other certifying officer and I are  responsible for establishing and maintaining disclosure controls and  procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the  Company and we have:                                                                                                                                                                     |
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|   | a)     | designed such disclosure controls and procedures, or  caused such disclosure controls and procedures to be designed under our  supervision, to ensure that material information relating to the Registrant,  including its consolidated subsidiaries, is made known to us by others within  those entities, particularly during the period in which this report is being  prepared;                  |
|   |   |                                                                                                                                                                                                                                                                                                                                                                                                 |
|   | b)     | [omitted in reliance on SEC Release No. 33-8238;  34-47986, Section III.E]                                                                                                                                                                                                                                                                                                                           |
|   |   |                                                                                                                                                                                                                                                                                                                                                                                                 |
|   | c)     | evaluated the effectiveness of the Company’s  disclosure controls and procedures and presented in this report our  conclusions about the effectiveness of the disclosure controls and  procedures, as of the end of the period covered by this report based on such  evaluation; and                                                                                                            |
|   |   |                                                                                                                                                                                                                                                                                                                                                                                                 |
|   | d)     | disclosed in this report any change in the Company’s  internal control over financial reporting that occurred during the Company’s  most recent fiscal quarter (the Company’s fourth fiscal quarter in the case  of an annual report) that has materially affected, or is reasonably likely to  materially affect, the Company’s internal control over financial reporting;  and |
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|   | 5.     | The Company’s other certifying officer and I have  disclosed, based on our most recent evaluation of internal control over  financial reporting, to the Company’s auditors and the audit committee of the  Company’s board of directors (or persons performing the equivalent  functions):                                                                                            |
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|   | a)     | all significant deficiencies and material weaknesses  in the design or operation of internal control over financial reporting which  are reasonably likely to adversely affect the Company’s ability to record,  process, summarize and report financial information; and                                                                                                                       |
|   |   |                                                                                                                                                                                                                                                                                                                                                                                                 |
|   | b)     | any fraud, whether or not material, that involves  management or other employees who have a significant role in the Company’s  internal control over financial reporting.                                                                                                                                                                                                                       |
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** **

Date: May 22, 2007

 
|        | /s/ MARC HOLLIDAY                       |   |
|--------|-----------------------------------------|--------|
| Name:  | Marc Holliday                           |
| Title: | President                               |
|   | of Reckson Associates Realty Corp.,     |
|   | the sole general partner of the Company |

 

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