[font=Verdana]Demolition of the old Sears Block on the [/font][font=Verdana]Peoria[/font][font=Verdana] riverfront begins on Monday. [/font][font=Verdana]After a morning ceremony that will include speeches by area dignitaries such as Caterpillar Inc. Chairman Jim Owens, workers will begin dismantling the department store and parking deck, clearing the way for a $67 million regional museum and Caterpillar's visitor