DOWNERS GROVE, ILL. — Rexnord Corp. will build a new manufacturing facility and aerospace headquarters in Downers Grove, about 20 miles west of Chicago. Rexnord will replace its existing 200,000-square-foot facility, built in 1956 and located at 2400 Curtiss St. within the Ellsworth Business Park. The 248,000-square-foot facility is slated for completion by 2019. The Downers Grove Economic Development Corp. worked closely with the project’s consulting firm, Cushman & Wakefield. Milwaukee-based Rexnord manufactures motion control, aerospace and water management products.