When Rainbow Group purchased 24 Manor Road, they seized the opportunity to make the building more energy efficient in a number of ways. Since the roof was in desperate need of replacement, they fitted the building with a new, more insulated roof that could also support a solar water-heating system. They also retrofitted the windows and balcony doors to improve thermal performance and reduce air leakage. The result was a reduction in natural gas use of 21%, a 157 tonne per year reduction in greenhouse gas emissions, and an estimated $1 million increase in building value. And this is just the beginning: Rainbow Group is planning even more retrofits.