McGraw-Hill Cos. is consolidating four Chicago-area offices into a 150,000-square-foot space at 1 Prudential Plaza in one of downtown Chicago's bigger office lease transactions in recent months, real estate industry sources say. The New York-based publisher, which currently leases 38,000 square feet at Prudential Plaza, is adding the educational publications unit acquired last year from Tribune Co., currently in north suburban Lincolnshire. Also, McGraw-Hill is moving other operations from Burr Ridge and the West Loop.