Unforgettable Twentieth Century architectural heritage, like this commercial building on 27 Gran Vía Street, influenced by the Chicago School of Architecture; require the use of appropriate techniques and firms, given that throughout its facades and unsuspected corners, appear unique elements created by the great Spanish architect Antonio Palacios. We carried out structural reinforcements, space planning and upgraded its installations such as: plumbing, electrical, telephone, fire protection, HVAC, telecommunication and elevator systems. Natural stone flooring, hardwood flooring, ceilings and all interior finishes were restored maintaining their original design and functionality. Also noteworthy, is the painstaking replacement of the curved glazing on its beautiful enclosed balconies, installed originally during the Civil War, with polygonal wood framing. During the second phase, the owner relied on us again to carry out an upgrade of the building to meet current fire regulation standards and to install new unique lighting.