Port of Piraeus permanent navy base for the mighty Athenian fleet. However, in the late 4th century BC began a long period of decline for Piraeus; the harbours were only occasionally used for the Byzantine fleet and the city was mostly deserted throughout the Ottoman occupation of Greece. In 2002 PPA and the Greek government signed a concession agreement. The Greek government leased the port zone lands, buildings and facilities of Piraeus Port to PPA for 40 years. In 2008 the duration of the concession agreement was modified from 40 to 50 years. With this modification the lease is ending in 2052. Since
Port of Redwood City International Airport and Palo Alto Airport; in contrast, wind speeds at the Port were found to be approximately half the levels of San Francisco Airport. This result is not surprising since Conomos observed that the wind speeds in Northern San Mateo County are high due to the San Bruno Gap in the Santa Cruz Mountains. The Port of Redwood City has more than one lineal mile of public access along Redwood Creek, including walkways, viewing areas and picnic areas. The Port provides a venue for a number of public events and festivals, including visits by historic ships and sailing vessels.