Yahoo CEO Marissa Mayer has been working hard to make over her company's image from aging web dinosaur to hip new tech property. As part of that plan, the Sunnyvale company is reportedly close to signing a new lease inside the San Francisco Chronicle building at Fifth and Mission Streets.

Mayer has a thing for eating up the square footage left behind by old media, apparently. Back in May, she announced the company would soon occupy four floors of the old New York Times Building in Manhattan and buying up a block of glitzy Times Square billboards to celebrate the re-launch of Flickr.

As AllThingsD reported last week, Yahoo's San Francisco office will most likely be taking over the 26,000 square foot space that Square heavily renovated in 2010. More recently, however, the Chronicle suggested Yahoo has been looking for something closer to 60,000 square feet. So, there's a chance the internet giant could spill over into even more of the paper's flagship property. A source tells SFist that they could possibly take over the building's third floor spot (now occupied by the Chron staff), which is set to undergo major renovations.

Yahoo already has three floors of bland office space on Sansome Street in the Financial District, but the glass canyons of the FiDi aren't exactly the most attractive location to commute to when your peers are lounging on rooftop gardens in Mid-Market. (Although, it doesn't require a shuttle bus down to Sunnyvale either.)

In other news, Yahoo's beloved Vegas-y billboard might make a comeback as well: a source inside the company told AllThingsD that their Marketing team is looking to reclaim some of its past glory, not just in web traffic, but also in neon lights.

Previously: Yahoo Announces Plan To 'Make Flickr Awesome Again'
Sign of the Times: Glowing Yahoo! Billboard to Come Down In December
[AllThingsD]
[Chron]