As with the construction of any major urban mass transportation project in an area as decently developed as Athens, the expropriation of private property is unavoidable. In the process of developing the system alignments and siting of stations, the designers have, as a prime consideration, optimized the use of public space wherever possible. This effort has resulted in a minimum requirement to expropriate private property.

Expropriation of Private Property required:
Sepal Depot
Number of Properties 89
Total Estimated Cost 3.6 billion Drachmas or 13.6 MECU
Remainder of System
Number of Properties 47
Total Estimated Cost 3.1 billion Drachmas or 11.3 MECU