The Oleg Palace, built in the 17th and 19th centuries, is the largest civic building in the Kremlin, with an area of 2530 sq. m. It was erected on the site of the princely court that existed until the 16th century. This beautiful building features colorful window frames, a baroque pediment, and tower windows, and once adorned its facade with an image of the famous Ryazan prince Oleg Ivanovich. Previously, it housed the residential chambers of Ryazan archbishops, their household church, brotherly cells, and service facilities. Now, the building is entirely dedicated to a museum, housing the main historical exhibitions of the reserve.

The 17th-century Singing Corps is a two-story brick building in a strict style, which once contained living quarters for archbishop servants and the administrator's reception area. It now hosts the museum exhibition "By Grandfather's Custom," dedicated to the life and holidays of the Russian people.

The economic buildings from the 17th and 19th centuries include storage sheds, a forge, a cooperage, stables, and a carriage house. These buildings are now used by the administrative services of the museum and reserve.

The 17th-century Consistory building served as the administrative building of the diocese, and now it houses a museum exhibition.

The Cherni Hotel and 17th-century granaries are located in the eastern part of the Kremlin and are used as exhibition halls and storage for the museum.

The Nobility Hotel, consisting of two buildings from the 17th and 19th centuries, was connected in the early 20th century by a church in the name of John the Theologian and previously served as a residential building. In 1995, it was transferred to the Ryazan diocese, and now it houses a spiritual seminary.