A promotional brochure forwarded by a tipster has revealed artistic renderings for changes now underway at the Historic Core’s HW Hellman Building. Real estate firm Standard Development, the owner of the 102-year-old former office building, is currently converting its upper floors into 188 luxury apartments. The 10-story structure, located at the northeast corner of 4th and Spring Streets, is alternatively known as the Banco Popular Building. According to the brochure, the future residential complex’s ground and basement levels will be activated with a combined 17,500 square feet of commercial space. Plans also call for the addition of a small structure atop the Hellman Building’s roof which would feature restaurant space and residential amenities such as a recreation room, a fitness room and an outdoor swimming pool. The adaptive reuse project is being designed by Omgivning, a Downtown-based architecture firm which specializes in the restoration of historic buildings.