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CHICAGO — MB Real Estate has arranged a 26,214-square-foot office lease renewal and expansion for Knight Engineering at the LaSalle Wacker Building in Chicago. The property is located at 221 N. LaSalle St. The full-service engineering and architectural firm renewed its lease for space on the third floor and expanded to a portion of the fourth floor at the office property. Knight Engineering is the largest tenant in the 416,000-square-foot, 41-story building. MB Real Estate has managed and leased the property since 2010. Walter Hennig and Kelsey Karp of MB Real Estate represented building ownership in the transaction. Knight Engineering was self-represented in the negotiations.