The Cisadane Riverfront is an external public space, where many people of different ages come to walk and sit around. Their visitation can impact its nature. This paper examined public space’s performance in Kota Lama Tangerang toward outdoor activities, whether of locals or visitors. One of the important considerations notes that this area is located in a national heritage site of Indonesia. It is crucial for the government to improve this historical area because it was a zero point of development in Tangerang city. The research involved drifting, site observation, and literature review. Using variables of the Good Public Space Index, these data were measured. The results indicated that Green Promenade had higher performance than the other two destinations. This paper conducted the causal aspect of external public space’s performance in the Cisadane Riverfront as a consideration for its future revitalization.