In Seireitei the Thirteen Protection Squads all have their own sector. Careful not to mingle into different sections uninvited though, there are some rivalry between divisions.
This is the General Relief Station, home to the 4th Division and run by Captain Unohana. If anyone if injured and needs to be attended too this is where you shall go or be taken to if under those circumstances...Patients are sorted into rooms and cared for by the Division. Although in other rooms where recuperation is complete, some may wish to spare with swords of a wooden variety.
This is where all future Shinigami are trained. Starting from lectures and talks, and going into more practical work. They train to use their Zanpaktou's and Kidou. Sometimes, the upper years get to go the Real World to practice in purifying real or decoy Hollows. Under supervision of upper ranks that is.Uniform is much the same as accomplished Shinigami, although gray and white for males and red and white for females.
Seireitei's very large library is full of many different types of books and texts, each containing various subject matters mostly to do with Soul Society and it's history. Real World texts may also be found here in order for vital information that Divisions may wish to use.
Within Seireitei are shops in which the more wealthier get to shop in for everyday needs or perhaps something for personal taste like the "Silver Dragonfly Glasses Store" where Vice-Captain Abarai Renji likes to by his sunglasses costing way too much and breaking them easily...it's everyone's choice for what to spend their earnings on.
Originally this was the execution ground for the Shinigami where a huge scythe-like blade used to by situated. However Kurosaki Ichigo destroyed this place and so now it is bare, a wide vast open space of dirt ground, accessed by an extremely long pathway up the side of it. Forests line the edges until you reach the opening. It provided a magnificent view of Seireitei and Rukongai however.