Elon Musk converted office space at Twitter's headquarters into bedrooms. Now San Francisco building inspectors are launching an investigation.

• Elon Musk reportedly arranged bedrooms at Twitter's headquarters, sources told Forbes.
• The San Francisco Department of Building Inspection is launching an investigation into the reports.

On Tuesday morning, Twitter employees arrived at their San Francisco headquarters to see a startling new development at the office: beds, nightstands, and comfortable armchairs.

Overnight, Musk had converted sections of Twitter's headquarters into bedrooms for "hardcore" staffers, according to Forbes. Musk was showing his support for employees who were so committed to their work they were ready to sleep at the office.

Sources familiar with the matter told Forbes there were anywhere between 4 to 8 bedrooms per floor that looked "comfortable."

But on Tuesday afternoon, Ted Goldberg, a senior editor at KQED, San Francisco's public radio station, tweeted that the San Francisco Department of Building Inspection was launching an investigation into the reports of Twitter's redesign.

Patrick Hannan, communications director for the San Francisco Department of Building Inspection, subsequently confirmed the investigation to Insider on Wednesday. Hannan said the department had received a compaint about Twitter's new furnishings on Tuesday morning through San Francisco's 311 system, a hotline for non-emergency municipal queries and concerns.

"We investigate all complaints. We need to make sure the building is being used as intended," Hannan told Insider by email. "There are different building code requirements for residential buildings, including those being used for short-term stays. These codes make sure people are using spaces safely. Everyone in San Francisco deserves a safe place to live, work, play and sleep and no one is above the law."

As of Wednesday afternoon, Hannan noted that the Department of Building Inspection was already reaching out to Twitter's building representatives to conduct a site inspection and would be commencing an investigation within 72 hours.

"If we find suite 900 no longer meets the building code, we'll issue a notice of violation, which will be posted to our website and at the site, just like all notices of violation," Hannan said.

Twitter has not yet responded to Insider's request for a comment.