SAN FRANCISCO (CBS SF) — San Francisco’s City Hall could become a advertising billboard if Mayor Ed Lee has his way.

The mayor has proposed to allow digital light displays on the east side of City Hall where corporations and event planners could advertise.

READ MORE: San José School District Secures Vaccine for Entire Workforce

The plan would bring in revenue to the city.

READ MORE: Golden Gate Fields Races to Make Up for Missed Vaccine Appointments

Cities around the world are already using the technology on landmarks, like the Empire State Building in New York.

MORE NEWS: Study Shows Stockton Universal Basic Income Experiment Led to Increased Employment

Critics say the plan would send a message that San Francisco City Hall is for sale.