Here’s one thing we know: No matter how gigantic convention centers and airports grow, they’re never big enough. Now we’ve heard through the grapevine that San Francisco will be the latest to loosen its belt a couple notches with the help of SOM and Mark Cavagnero Associates. The city is jumping on the expansion bandwagon with the addition of 200,000 to 450,000 square feet to the Moscone Convention Center in the South of Market neighborhood. The original center opened in 1981 and its first expansion, Moscone West, followed in 2003.

This latest expansion would include a Third Street addition, a six-story, 260,000 square-foot building to the east of the current facilities; the Howard Street Connection, a roughly 11,000 square-foot underground facility between the current Moscone North and South facilities; and Moscone East, a 4-story, 240,000 square-foot, partially-subterranean building also to the east of the current facilities. An official announcement about the project is expected on Thursday.

Cavagnero recently took home the AIA California Council’s Firm Award and newly renovated and expanded the Oakland Museum of California. SOM, of course, is finishing up One World Trade Center in Lower Manhattan and on the west coast just opened up a new design studio in Los Angeles.