No introductions are needed when the law firm of Crane and Norcross goes to Cook County Assessor Joseph Berrios asking him to lower the value he’s placed on properties owned by the firm’s clients. The Chicago law firm comes to Berrios to lower the property assessments on hundreds of properties across the city and suburbs each year, saving some of its clients as much as $100,000 or more in property taxes as a result. Since September 2009, when he launched his first campaign for assessor, Berrios’ campaign funds have gotten $60,900 in contributions from employees of Crane and Norcross, records...