However, a chengguan official, who did not want to be identified, declined to give details about the move on Sunday, saying the "special measure is still under consideration".
Another government official said opening restrooms to the public would affect normal operations in government departments' buildings, and cause difficulty for management.
Han first proposed the measure in April, saying he had been angered by reading about how Tianhe district's legal aid center had turned away a mother and daughter that month.
According to media reports, the 3-year-old girl had a stomach ache and had asked to use a toilet while her mother, surnamed Xia, was taking her to a kindergarten.
Yet, they were refused at the gate, as personnel cited concerns over security.
Guangzhou has a population of more than 16 million but just 1,500 public toilets on the street.
Many residents and tourists have welcomed the measure.
Beijing experiences windy weather, temperature drop