The Late Antique Irene Building was unearthed during rescue archaeological excavations, carried out in the centre of Plovdiv in 1983–1984. It is located in the centre of  modern-day Plovdiv, to the northeast of the Forum and in close proximity to the Bishop’s Basilica. The building, together with parts of the ancient street network, is  preserved and displayed in situ in a modern-day pedestrian underpass named Archaeological.
The late antique residential building occupied two-thirds of an insula (block) in the centre of ancient Philippopolis and had a representative part and domestic quarters.  The representative part, a peristyle courtyard, surrounded by porticos and several rooms with polychrome mosaic floors, dates back to the 4th–5th centuries.
With a total area of 160 sq.m, the mosaics depict various geometric ornamental patterns, rich in floral and figural representations. The remains of a kiln for producing glass and smalt, discovered in the peristyle courtyard, serve as key evidence of the activity of the mosaic workshop.
Evidence of the important place and the role the owner of the Irene Building played in the life of Philippopolis is provided by the cardo street that was specially built  alongside the construction of the Bishop’s Basilica as a direct connection between the two buildings. The Late Antique Irene Building is believed to have functioned as  a residence of the Bishop of Philippopolis.