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                                POWER OF ATTORNEY

                                                           Exhibit 24.5


STATE OF MICHIGAN    )
                     ) SS
COUNTY OF WASHTENAW  )


         KNOW ALL MEN BY THESE PRESENTS that Donald S. Chisholm, having an
address at Ann Arbor, Michigan, has made, constituted and appointed and BY THESE
PRESENTS, does make, constitute and appoint John M. Zoeller and Howard Walker,
or either of them, having an address at Two North Riverside Plaza, Chicago,
Illinois 60606, his true and lawful Attorney-in-Fact for him and in his name,
place and stead to sign and execute in any and all capacities this Annual Report
on Form 10-K and any or all amendments to this Annual Report on Form 10-K, and
to file the same with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, giving and granting unto
each of such, Attorney-in-Fact, full power and authority to do and perform each
and every act and thing, requisite and necessary to be done in and about the
premises, as fully, to all intents and purposes as he might or could do if
personally present at the doing thereof, with full power of substitution and
revocation, hereby ratifying and confirming all that each of such
Attorney-in-Fact or his substitutes shall lawfully do or cause to be done by
virtue hereof.

         This power of Attorney shall remain in full force and effect until
terminated by the undersigned through the instrumentality of a signed writing.

         IN WITNESS WHEREOF, Donald S. Chisholm, has hereunto, set his hand this
2nd day of March, 2001.


                                         /s/ Donald S. Chisholm
                                         --------------------------------------
                                         Donald S. Chisholm



         I, Nancy C. Gross, a Notary Public in and for said County in the State
aforesaid, do hereby certify that Donald S. Chisholm, personally know to me to
be the same person whose name is subscribed to the foregoing instrument appeared
before me this day in person and acknowledged that he signed and delivered said
instrument as his own free voluntary act for the uses and purposes therein set
forth.

         Given under my hand and notarial seal this 2nd day of March, 2001.


                                         /s/ Nancy C. Gross
                                         --------------------------------------
                                         (Notary Public)


My Commission Expires:

July 16, 2002