Above the ground flour window of the building are four reliefs of Greek/Roman gods and godesses. From left to right:
Demeter (Δημήτηρ) in Greek and Ceres in Roman mythology, the goddess of agriculture, grain crops, fertility and motherly relationships
(Wikipedia: Ceres and Demeter).
(Παλλὰς Ἀθηνᾶ) in Greek, or Minerva, in Roman mythology, is the goddess of war, civilization, wisdom, etc. She is often depicted with an owl, which symbolizes her ties to wisdom.
(Wikipedia: Athena and Minerva).
(Ζεύς) in Greek, or Jupiter, in Roman mythology, is the god of sky and thunder and the father of all gods
(Wikipedia: Zeus and Jupiter).
Poseidon (Ποσειδῶν) in Greek, or Neptunus, in Roman mythology, is the god of water and the sea
(Wikipedia: Poseidon and Neptune).