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EXHIBIT 31.1

CERTIFICATIONS

I, Richard D. Kincaid, certify that:



|1. |  | I have reviewed this annual report on Form 10-K of EOP Operating
Limited Partnership;
|-- |  | -------------------------------------------------------------------------------------



|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;
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|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 registrant as of, and for, the periods presented in
this report;
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. |  | The registrant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
registrant and have:
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (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) |  | evaluated the effectiveness of the
registrant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
| | --- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (c) |  | disclosed in this report any change in
the registrants internal control over financial reporting
that occurred during the registrants most recent fiscal
quarter (the registrants fourth fiscal quarter in the
case of an annual report) that has materially affected, or
is reasonably likely to materially affect, the
registrants internal control over financial reporting;
and
| | --- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. |  | The registrants other certifying officer and I have disclosed,
based on our most recent evaluation of internal control over financial
reporting, to the registrants auditors and the audit committee of the
registrants board of directors (or persons performing the equivalent
functions):
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (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 registrant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 registrants internal control over
financial reporting.
| | --- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Date: March 15, 2004
    
    /s/ RICHARD D. KINCAIDRichard D. KincaidPresident and Chief Executive Officer of
Equity Office Properties Trust, the general partner of
EOP Operating Limited Partnership


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I, Marsha C. Williams, certify that:



|1. |  | I have reviewed this annual report on Form 10-K of EOP Operating
Limited Partnership;
|-- |  | -------------------------------------------------------------------------------------



|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;
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|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 registrant as of, and for, the periods presented in
this report;
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. |  | The registrant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
registrant and have:
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (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) |  | evaluated the effectiveness of the registrant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
| | --- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (c) |  | disclosed in this report any change in
the registrants internal control over financial reporting
that occurred during the registrants most recent fiscal
quarter (the registrants fourth fiscal quarter in the case of an
annual report) that has materially affected, or is
reasonably likely to materially affect, the registrants
internal control over financial reporting; and
| | --- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. |  | The registrants other certifying officer and I have disclosed,
based on our most recent evaluation of internal control over financial
reporting, to the registrants auditors and the audit committee of the
registrants board of directors (or persons performing the equivalent
functions):
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (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
registrant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
registrants internal control over financial reporting.
| | --- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Date: March 15, 2004
    
    /s/ MARSHA C. WILLIAMSMarsha C. WilliamsExecutive Vice President and Chief Financial Officer of
Equity Office Properties Trust, the general partner of
EOP Operating Limited Partnership


84