Following news last week that Facebook and/or its subsidiary Instagram was eyeing office space in the new 181 Fremont tower — with one rumor suggesting they might want to take the entirety of the tower's office space — the SF Business Times now has it that the company is also in talks for a lease at the Chronicle's iconic Fifth and Mission building. The move, as CNBC notes, would be especially ironic given the fact that the social media giant has "already replaced the daily newspaper as the primary news source for a lot of readers," and the Chronicle has been steadily giving up space in their own building over several years because they no longer need it.

Yahoo has occupied the 68,000 feet that's up for grabs at the Chronicle since 2013, and their lease is up next year — also, Yahoo is basically a thing called Altaba now, and they probably won't need more than a couple desks soon.

CNBC confirms that Facebook has signed a letter of intent for space in 181 Fremont, though it remains unclear how much space we're talking about. A source last week told TechCrunch that they were only considering a "test" space of sorts for 100 or so employees — which would be the first time Facebook had leased space in what's essentially their home city, having stubbornly kept all their employees on shuttle buses and in cars to and from Menlo Park all these years.

A source tells CNBC that Facebook is looking at both 181 Fremont and another space in SF, but did not confirm that other space was the Chronicle headquarters.

Facebook employees have been pushing the company to open an SF office — as other tech companies like Google and competitor Twitter have — for at least a year, and there's little doubt that being solely based in Menlo Park and requiring that 30-mile commute has impacted employee attraction and retention.

As TechCrunch pointed out, Facebook now has offices in 68 cities worldwide, and yet when staffers need to host a meeting in San Francisco they have to do so at their PR firm's offices.

Previously: Facebook Employees Actually Hate Commuting, Beg For SF Office