Alter Studio Architetti Associati shared with us their design, which won second place, for the Tower House Competition for Treviso, Italy, which challenged architects to refurbish a twenty story landmark in the area. The proposal transforms the existing tower into 3 attached structures, each of which is designed with its own energy strategy. Photovoltaic panels on the roof and south façade provide 60 + 15 kw of power, which combined with bioclimatic devices brings the CO2 emissions down to zero. More images and architects’ description after the break.