Not to mention that having the name LEED attached to your project isn't a sign of your efficiency, and not all green buildings apply for LEED certification. There are far more out there that either exceed LEED standards or meet them, and don't apply for certification because it costs money to apply, and the process can be annoying to go through. LEED has become nothing more than a marketing ploy, as it is increasingly easy for anyone to achieve, and it sells easy.
Eg. All of Canadian Tire's new builds meet LEED standards and would qualify for certification (Silver), however the costs associated with applying and the process which the project must go through to get certified would result in extra costs and delays. Many older stores have also gone through energy retrofits to be brought up to the same standards as new builds. Walmart is also big on energy efficiency and meeting LEED standards, yet doesn't apply for certification either.
Minto and Tribute are two home builders that I can name off the top of my head that are also big on sustainability and energy efficiency. Minto uses this to sell homes, and does apply for LEED certification for a few of their big projects, but many more of their projects meet the standards too. Tribute does not rely on slapping the LEED name on their properties to sell units, however they also have high standards when it comes to efficiency and sustainability. Just because a developer isn't selling their project with LEED signs stamped to it, doesn't mean they aren't trying. Tridel is also big on LEED standards for its buildings.
When I did work with Tribute, it was mentioned that sustainability and energy efficiency is one of the top things on people's minds when purchasing a new unit. For a developer to ignore something that would make them more money makes no sense. It doesn't mean that all developers are going crazy with green construction, but most have caught on. Concord Adex has yet to catch on, but many of the buildings have gone on their own and been completely retrofitted to make them more efficient, so even without the developer caring, the residents still have the power to make changes that create massive savings for themselves, and for the environment.
Finding actual energy savings in a residential project is much tougher than that of an office project because each individual home owner has control of their unit. A developer can put in energy efficient bulbs, thermostats, toilets, taps etc., but the homeowner will most likely replace all of these at some point. As for heating and cooling, a more efficient building won't cost much more to heat or cool since the heating and cooling systems are always running due to the differing needs of each individual unit. Having your heat running 24/7 will not cost anymore than using it a few hours a day when living in a condominium.
Last but not least, MaRS phase II is going for LEED Gold Certification.