Commercial agora have the sizes of 90X95m and was built 2nd century AD. Only the foundations of this building which is made of a courtyard with the sizes 60X65m, the shops behind these and the stoats around this courtyard have survived through the present day. The building has a propylon (monumental gate in ancient architecture, located at the entrance of a building or a group of buildings. There are columns on its sides facing both the interior and the exterior ) facing the street. Shops doors overlooking the streets open to street and those of the shops overlooking the courtyard open to the courtyard.
There are nine shops some of which have doors opening to the stage building of the theater on the side leaning against the theater building. During its active times agora was the place hosting all kinds off cultural and commercial activities of the city. The trade of the slaves were also known to be conducted here during the periods when Side was also involved in privacy. It was revealed that circular plan building having 12 Korinth style columns which is situated in Agora courtyard and whose picture is seen on the Side coins, was erected in the name of the god of good fortune Tykhe.
The buildingís roof had the shape of a pyramid with 12 sides. On its dome shaped cailing there were the symbols of the Zodiac signs ( symbols of the star groups ).
Latrina structure ( toilet ) suitable for 24 people is also located at the north western corner of agora. Latrine is in the form of a semi-circular hall with marble covered walls. Owing to its interesting plan and formation, the toilet, which has survived through our day without substantial damage, is among the places worth visiting around Side.