Dive summary:

• If the city council approves them, building code changes in Washington, D.C., are intended to reduce energy consumption by 30%.
• The targeted structures are new or substantially renovated buildings over 10,000 square feet and multifamily buildings over three stories.
• The proposals are based on 2012 revisions to international building standards, though the city could have gone with the 2009 version.

From the article:

In a statement, Mayor Vincent Gray said the new codes make clear "our strong commitment to being a national and global leader in sustainable building practices." ...