EXHIBIT 24.6
 
                               POWER OF ATTORNEY
                               -----------------


STATE OF ILLINOIS
COUNTY OF COOK 


      KNOW ALL MEN BY THESE PRESENTS that Henry H. Goldberg, having an address
at 4733 Bethesda Ave., #400, Bethesda, MD, 20814, has made, constituted and
appointed and BY THESE PRESENTS, does make, constitute and appoint Douglas
Crocker II and Michael J. McHugh, 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 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 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 an 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, Henry H. Goldberg, has hereunto set his hand this
24th day of February, 1997.

                                                  /s/ Henry H. Goldberg 
                                                  --------------------------
                                                  Henry H. Goldberg

     I, Patricia M. Nesti, a Notary Public in and for said County in
the State of aforesaid, do hereby certify that Henry H. Goldberg, personally
known 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 24th day of February, 1997.


                                                        /s/ Patricia M. Nesti
                                                        ---------------------
                                                           (Notary Public)


My Commission Expires:

       1/24/98