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EXHIBIT 31.1

CERTIFICATIONS
CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND PRESIDENT

I, Jeffrey E. Kelter, certify that:

1. I have reviewed this annual report of Keystone Property
Trust;

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)) and internal control
over financial reporting (as defined in Exchange Act Rules 13a-15(f) and
15d-15(f)) 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) Designed such internal control over financial reporting, or caused such
internal control over financial reporting to be designed under our supervision,
to provide reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for external purposes in
accordance with generally accepted accounting principles;

(c) 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

(d) 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 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 trustees:

(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.



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Date: February 18, 2004
    
    /s/ Jeffrey E. Kelter
Jeffrey E. Kelter
President and Chief Executive Officer


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