UPDATE: The post below has been superceded by a newer post with updated data. 
Please click here for the more recent (2012) update and analysis of LEED Platinum projects.
This is the older post:
Platinum is the highest rating in the LEED green building rating system; it’s one level higher than Gold. Building projects that have attained this rigorous level of certification are among the greenest in the world.
I recently added the latest set of Platinum-rated projects (buildings, homes, offices, and stores) to my listing of LEED Platinum Certified Building Projects Worldwide. This unique listing is organized by country and—within the U.S.—by state. Some of the listed projects are linked to online case studies. The listing includes projects of all types, from every LEED rating system: New Construction (and Major Renovations), Existing Buildings/Operations & Maintenance, Commercial Interiors, Core & Shell, Homes, Schools, and Retail. It is primarily compiled from the data provided in the USGBC/GBCI’s directory of LEED certified projects and the USGBC’s most recently posted list of LEED for Homes certified residences.
There are now hundreds of LEED Platinum certified projects. As of my latest review of the data (at the very beginning of 2011), it appears that projects in 47 of the 50 U.S. states (all states except Alabama, North Dakota, and West Virginia) have achieved the LEED Platinum rating to date, along with projects in Washington DC and Puerto Rico.
California has more than 130 LEED Platinum certified projects (at last count), which is more than twice as many as there are in any other state, and it’s also more than twice as many as California had only a year ago. In terms of the absolute number of LEED Platinum certified projects in each state, California is followed by Oregon (with almost 60 projects), and then Texas, New York, and Massachusetts (each of which has between 30-40 projects). If you take state populations into account, Oregon clearly has the lead (for the greatest number of LEED Platinum certified projects per capita).
Worldwide, Platinum rated projects now exist in 16 countries. Outside of the U.S., there are projects in Australia, Brazil, Canada, China, Finland, Germany, Great Britain, India, Saudi Arabia, South Korea, Spain, Sri Lanka, Sweden, Thailand, and the United Arab Emirates. Among these, India has the most, with 20 projects so far.
The range of Platinum project types is very broad. In addition to high-profile projects (such as the California Academy of Sciences in San Francisco, and the William J. Clinton Presidential Center in Little Rock) and a number of high-end offices and luxury residences, LEED Platinum projects also include several public buildings (such as San Jose City Hall) and a surprising number of affordable housing projects. The following are just a few examples of the many affordable housing projects that have achieved the LEED Platinum rating: 51 single-family, detached homes built by Habitat for Humanity in St. Louis, MO; the General Colin L. Powell Apartments in the South Bronx, NY; Wisdom Way Solar Village homes in Greenfield, MA; Autumn Terrace mixed-use housing development in San Marcos, CA; Vista Dunes in La Quinta, CA; and a variety of affordable homes in New Orleans, Louisiana.
Note: Another green building certification, which is widely considered to be an even higher bar to reach than LEED Platinum, is the Living Building Challenge. To date, three projects have achieved the Living Building Challenge certification: the Tyson Living Learning Center in Eureka, Missouri; the Omega Center for Sustainable Living in Rhinebeck, New York (which also got a LEED Platinum certification); and the Eco-Sense home in Victoria, British Columbia.
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And the LEED Platinum photo of the plaque is that of the NJ Meadowland Commission’s.