Architectural challenge in dealing with historical building substance when adding floors

How can this succeed, especially when the proportions between the existing building and the new building are such that the increase in volume that characterizes the townscape is particularly noticeable?

One way of dealing with the addition of a new volume to a historic building is the suggestion of lightness - here through a bright and friendly metal construction with textile shading elements (markisolettes / Venetians). The structure and order of the construction follow the stringent façade grid of the existing building. The effect of "floating" is made possible by the "lifting off" of the upper structure from the lower (solid) base of the building. The design gap between the old and new building is created by the continuous setting back of the glazing. An exciting momentum is created by the fact that the volume of the increase along the front of the building is set back compared to the facade of the historic building.