Opening of the Day: The San Francisco 49ers cut the ribbon on their new $1.2 billion stadium, the first LEED Gold-certified stadium in the National Football League, on Thursday. [ABC News] Designed by HNTB, Levi's Stadium is in Santa Clara, Calif., roughly 40 miles from Candlestick Park ("The Stick"), the team's former San Francisco stadium.

Number of the Day: $20 million—The amount that Chicago's Polk Family donated for the redevelopment of Navy Pier's Gateway Park. [Chicago Tribune]

Maps of the Day: Google Maps added London to its list of 3D-mapped cities, which includes Paris, Rome, New York, and Los Angeles. [Dezeen]

5 More Stories for Friday:

New York-based Joss Realty says now is the time to buy into the Washington, D.C., office market. [Washington Business Journal]

Here are six projects that are making huge impacts on urban landscapes. [Mashable]

Why images of contemporary architectural ruins (see: Detroit) are click-bait. [Co.Design]

Australia has repealed its carbon tax. Australian polls still support action on climate change, in what form is up in the air. [Vox]

A tiny portable house built with water tanks. [Designboom]

Step Up, Step Down:

Massimiliano Gioni has been promoted to artistic director at the New Museum in New York.

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