CIAL Sakuragicho is located under the elevated tracks of the JR lines, and is divided into two buildings: the "Koyozaka Gallery" on the north ticket gate side and the "Teishajo Buffet" on the station square side.

(Source: CIAL Sakuragicho Official Floor Map)
The above is the floor map for the Koyozaka Gallery side of CIAL Sakuragicho.
Focus on the North Ticket Gate on the right side of the map! You can access CIAL Sakuragicho directly from the front after exiting the North Ticket Gate.
The Koyozaka side has many delicatessen shops, headed by "Chungking Hanten," a long-established Chinese restaurant.
And, there was a place to sit and take a break at the "City Tram Map Plaza" in front of the Docomo Shop, number 14 on the map!

(Provided by Twitter follower)
There were 6 wooden benches, each with three seats!
The benches are arranged in two rows with a wide spacing, so you can take a break without feeling cramped even if it's crowded.
Another great feature is that you can use the CIAL free Wi-Fi, which is available from 10:00 to 22:00.
As it is very close to the station, I think it will be useful as a meeting place in Sakuragicho.
When you go to Colette Mare, Queens Square, or MARK IS, this is the place to meet up, considering the direction.
So, why not use it as a place to take a break and sit down in Sakuragicho while you're shopping at CIAL Sakuragicho?
Update Information
▼September 5, 2018 Information provided by Twitter follower!
The benches were removed and moved as an event space during the summer vacation period in August, but they have been restored!
It was a convenient rest area near Sakuragicho Station, so it's good that the benches are back...!
However, please note that the benches may be relocated during regular events.
(Thank you for providing the information!)
▼August 17, 2018 Information provided by Twitter follower!
The rest area has been turned into a gachapon corner, and the benches have been removed. Too bad...

It seems that the benches have been moved to the passage in front of the restrooms on the "CIAL Koyozaka side restrooms".
However, this may be due to the special circumstances of the summer vacation, so there is a possibility that the benches will be restored.
In addition, the free Wi-Fi can be used.
(Thank you for providing the information!)
▼We checked the congestion situation of the places to sit on April 7, 2018.
【Congestion check】
Saturday around 20:00, weather clear.
Some were used as exhibition spaces, and the number of benches was half, and they were full.
Free Wi-Fi is available and convenient for meeting in Sakuragicho!
https://t.co/pz7s3xpL9O— Search for places to sit and rest (@sitdownplace) April 7, 2018



