The Church of Athanasius of Athos is the earliest surviving building of the complex, expanded by a later chapel. In 1840, a four-pitched brick vault was built instead of the previous wooden dome, which had been placed over a flat ceiling. At the request of the parishioners, the walls were raised by 1.5 arshins. In 1842, a new carved and gilded iconostasis appeared in the church, and in 1850, the walls were adorned with paintings on the themes of the Symbol of Faith and the miracles of the Iveron Icon. In the bell tower's cell, there was a tiled stove. In the early 1860s, a small two-story sacristy was added to the bell tower, and the chapel was connected to the porch by an arch. The brick walls are partially plastered and whitewashed. This is a unique monument of late Baroque with an archaized composition and decoration. The square of the temple with a semicircular apse of the altar, flanked by rectangular volumes, is topped with a low vault and a small two-tiered light drum. To the west, it adjoins the bell tower with a third tier, crowned with an unusual four-sided tent with three rows of openings. The facades of the square are divided by pilasters into three sections with a slight retreat at the corners. The upper tier, separated by a profiled belt, interrupted on the central axis by a kiot, is topped with a cornice featuring a three-row saw, which has only survived on the eastern facade. Such cornices finish the tiers of the bell tower. The unadorned forms of the pilasters, which divide the facades of the upper tier, as well as the low four-sided roof with a two-tiered light drum and dormer windows resembling attic windows, indicate a low level of professionalism among the stonemasons. The two lower tiers of the bell tower, divided by a narrow belt with a ledge transitioning into the archivolt of the main entrance's arched opening, are marked by paired pilasters at the corners. Above, on the sides of the ringing arches, short single pilasters do not reach the cornice. The chapel, which closes the entire lower tier of the southern facade of the temple, has a similar but slightly lowered altar part, decorated with large ribbon rustication. The facade of the chapel with three windows is topped with a pediment and flanked by pilasters. The frames of the rectangular openings with ears at the top are finished with large keystone stones. Inside, the square space of the main temple is covered with a vault featuring a ring of a light drum in the center and is connected by three openings to the altar, which is covered with barrel vaults. Previously, there were choirs at the western wall, connected by an opening to the cell in the bell tower. The first tier of the bell tower also has a barrel vault and is connected by openings in the side facades to later tents. The chapel is covered with a semi-pitched vault with formwork above the openings of the windows, exits to the main temple, and the later narthex at the western facade. The low vault of the altar of the chapel is pierced by the conch of the apse and the formwork of the royal gates' opening.