ROSEMONT Looking to lease office and operate a business in Rosemont, Illinois? Call Imperial Realty Representative at (847) 899-5559. Allow us to assist you find the office space in Rosemont. Our leasing agents will work hard to get you the best lease/rent terms. We are waiting for your call. Welcome to Rosemont! Looking to operate a Business in Rosemont, Illinois? Anyone operating a business in Rosemont will need to apply for and be issued a business license. A general business license application can be found if you click here. You may also request an application in person by visiting Village Hall at 9501 W. Devon Avenue, Rosemont, IL. Building and Plan Review Whether you are starting a new business or expanding or remodeling an existing business, you must obtain a building permit at the Building Department which is located at Village Hall. Building permit applications and building contractors licenses can be obtained at the Village Hall or can be downloaded (see links to the right). The Village of Rosemont uses B.O.C.A. building codes and N.F.P.A. Life Safety codes.