This architectural complex, the most complex in construction and forms among the monastery ensemble's structures, combines the bell tower, refectory, warm church of the Nativity of Christ, and the church of St. Onuphrius.

From the outside, the complex appears as a massive, austere two-story building without excesses or decorations, closely adjoining the bell tower. The only decorative elements on the smooth walls are two patterned brick bands: one divides the building into two floors, while the other completes the top of the wall. Small windows, set deep within the thick walls, lack even simple casings.

The refectory resembles the Faceted Chamber of the Moscow Kremlin in its design. It is a large hall of 260 square meters with a vaulted ceiling supported by the walls and one square central pillar. Small windows embedded in the walls provide good natural lighting. While the ratio of window light area to floor area in modern buildings is 1:3 or 1:6, in the refectory it is 1:50. Nevertheless, due to the structural features of the windows and reflected light, the room is sufficiently bright.

The refectory has excellent acoustics: the vaults reflect and direct sound so well that even softly spoken words in one corner can be heard in the opposite one. A unique feature of the building is that there were no heating stoves in its rooms in the past. Warm air from the first floor, where the bakery and kitchen were located, warmed the upper chambers through channels in the walls. This warmth was sufficient for the year-round functioning of the church and refectory. This type of heating is now called convective heating. The floors of the refectory were laid with tile bricks and were situated 40-50 cm below the current level, giving it volume and lightness. The volume of the refectory was almost 150 cubic meters larger than modern ones.

The "Historical Description of the Borovsky Pafnuty Monastery" states that the rooms of the church and refectory were once adorned with wall paintings, destroyed during the French invasion in 1812. To the east, two rooms adjoin the refectory, built in one volume with it: the church of the Nativity of Christ and the cellarer's quarters. Initially, the church had one altar and was separated from the refectory by a solid wall with a door. In 1776, a chapel in honor of St. Onuphrius was arranged in the cellarer's chamber adjoining the church from the south, and after the fire and devastation in 1812, the monastery's sacristy was placed here, where part of the expensive church vestments, embroidered with gold and silver and adorned with precious stones, donated by generous benefactors, was kept.

In a photograph of the building taken before restoration work began, two small domes with crosses are visible: one above the church of the Nativity of Christ, the other above the church of St. Onuphrius. Currently, where the church of St. Onuphrius stood, there is an icon and bookshop, and the church of the Nativity of Christ has been restored, although it has not yet been consecrated. Porches adjoin the refectory from the north and south. The northern porch is part of the massive bell tower built in the 17th century. A wide brick staircase with high steps, unusual for modern people, leads to the refectory from the north. Here, fresco paintings from the 17th century have been preserved on the vaults, walls, and pillars, which were severely damaged in the 1812 fire and have not been restored, only whitewashed. Restoration artists in 1970 and 1975 studied the condition of the paintings and concluded that they are of great interest and should be restored. The lower part of the walls is decorated with patterns, above which are figures of saints nearly life-size, and higher up on the vault, waist-length figures in circles entwined with grapevines.

A staircase leads up from the porch to the former monastery library and sacristy, and then to the top of the bell tower. The lower floor previously housed the brotherhood's bakery, kitchen, and storerooms. Today, restoration work is nearly complete: the rooms have been restored, and modern equipment has been purchased for the bakery, where bread and pastries are baked for the needs of the monastery and pilgrims using ancient recipes.