Limited Power of Attorney - Securities Law Compliance

I, as an officer or director of Silicon Valley Bancshares and
subsidiaries ("SVB"), appoint Derek Witte, Annie Loo and
Lisa Bertolet, and each of them, my true and lawful attorney-in-
fact and agent to complete and execute Forms 144, Forms 3, 4 and 5
and other forms as the attorney determines in his or her discretion
to be required or advisable pursuant to Rule 144 under the Securities
Act of 1933 (as amended), Section 16 of the Securities Exchange Act
of 1934 (as amended) and its rules and regulations, or any successor
laws and regulations, as a consequence of my ownership, acquisition
or disposition of securities of SVB, and to do all acts necessary in
order to file my forms with the Securities and Exchange Commission,
any securities exchange or national association, SVB and other person
or agency as the attorney deems appropriate.  I ratify and confirm
all that the attorneys-in-fact and agents do or cause to be done.

This Limited Power of Attorney is executed in __Santa Clara__, CA as
of the date below and shall remain effective until July 31, 2005,
unless I am no longer required to complete said forms.



Signatures

(s) Donal Delaney
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Donal Delaney
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Type or Print Name

Dated:  12/21/04

Witness:

Signature

(s) Jack Jenkins-Stark
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Jack Jenkins-Stark
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Type or Print Name

Dated:  12/21/04