An “X” signal put in on Twitter’s San Francisco headquarters on Friday as a part of the corporate’s rebranding is underneath investigation by the town for missing correct permits, in line with officers.

“A building permit is required to make sure the sign is structurally sound and installed safely,” Patrick Hannan, a spokesman for the San Francisco Department of Building Inspection mentioned in an announcement on Sunday. “Planning review and approval is also necessary for the installation of this sign.”

An inspector went to the Twitter headquarters on Friday to inform the corporate that it was in violation and to request entry to the roof to examine the signal, in line with a complaint filed with the city.

Twitter representatives advised the inspector that the signal was a “temporary lighted sign for an event,” the criticism mentioned.

Inspectors with the town tried to realize entry to the roof a second time on Saturday, however “upon arrival access was denied again by tenant,” the criticism mentioned.

Twitter didn’t instantly reply to a request for touch upon Sunday.

Matt Dorsey, the District 6 supervisor who represents the a part of the town the place Twitter has its headquarters, mentioned the corporate appeared to be in an “adversarial posture” when it refused to let constructing inspectors in. He mentioned he hoped that it could change its stance.

“I would like to sort of extend an olive branch,” Mr. Dorsey mentioned. “I think there’s a lot of people in city government who would welcome the opportunity to work with a large employer like X, and let’s figure out what we’re going to do with the sign, but we can have a good productive partnership with a city employer.”

This shouldn’t be the primary time the social media firm has run into a difficulty over signage.

The San Francisco police stopped staff on Monday from eradicating the model’s iconic chicken brand from the facet of the constructing, saying that the employees had not taped off the sidewalk to maintain pedestrians protected if something fell, The Associated Press reported.

A criticism about that signal’s removing was also filed with the city. The “X” was put in shortly after the unique signal was eliminated, The A.P. reported.