I've been in a LEEDs Gold building for about a half year now. Beforehand I was never a big LEEDs fan. Since being in the building I've learned that I've had some misconceptions, but also some accurate perceptions about LEEDs. Some random stuff:
It's expensive, no doubt about that. Our local Congresswoman insisted on Gold LEEDs minimum when she said that we had to move into a new building that she funded with her PAC funds, your tax dollars. 15,000 sq ft, $8.1 mil, with the university campus we're on donating the land and running the construction (and being given eventual ownership of the building in a fed to state transfer).
I was griping for several years about how the weekend after they made me move into an eco-friendly, no air conditioning building, that I would be going straight to Home Depot to get a portable AC unit for my office. It turns out that they intelligently designed the building ventilation system. High and low windows, ceiling fans in all offices, and some funky temperature sensitive skylight system that opens and closes to either vent or store heat, as required. I had to eat my words. I am more comfortable in this building than I was in the 1930s Naval Reserve bombproof brick building I was in before, where me and my boss being the only people in the office that are always hot rather than cold, I had the worst insulated, hottest office in the building with a crappy AC unit that I was stuck in because office space is by pay grade, so I had to keep the third biggest office. In the new building I got lucky that the #3 office was on the first floor, so that helps a lot with keeping my office cooler. It's been staying close to 72 since we've been in the building. So I'm impressed with the eco-friendly cooling solution.
The eco-friendly heating solution is apparently not so hot. I've never turned my heater on, but it apparently only has a 6-8deg range, using some kind of seawater exchange system to grab a temperature delta from water piped through pipes on the roof and underground. All the cold people in the office are always freezing, even on the second floor. This is apparently a high tech and expensive energy saver. There is apparently also a seawater exchange system for the 'air conditioning" in the IDF / server room in the building. I've already had that (expensive) system fail twice on me, sending temps up into the high 80s in a room that is supposed to be kept at 73. When it works, it does keep the room at constant temp.
The crappy thing about both heating and cooling is that they require occupant behavioral changes for them to work properly. Some upstairs windows have to be kept open at night certain times of the year or the building won't "breath", and for proper cooling, everyone is supposed to keep their office doors open all the time, which kind of defeats the purpose of a door. As I keep a GSA security container, I get to keep my door closed whenever I want, and because my office faces the ocean, an open window cools me down just fine, bur of course it means I'm not "contributing" cooling to the other building occupants (It takes a village!).
Other dumb stuff, that really doesn't have anything to do with energy savings in the building itself, are the "social environmental" things that had to be done for a Gold rating. For instance, part of the street facing exterior wall is some fancy South American renewable wood. Again, really expensive versus getting a domestic product, and we certainly have renewable wood in the US. Other social environmental things include us not having paper towels, except in the kitchen, not using plastic water bottles in the building (which I do just out of spite, and I like to toss a couple of plastic bottles into a trash can just before a LEEDS tour), no paper plates (they put a dishwasher in for us and provided plates and glassware) and other typical "behaviors" of your average Prius drivers.
So I have seen some workable solutions that are likely cheaper than conventional solutions (like the ventilation system vs AC), some probably workable, but very expensive solutions, and plenty of outright phony baloney eco-hippie living social stuff.