Concessions and leases in international relations

In international relations, a concession is a "synallagmatic act by which a State transfers the exercise of rights or functions proper to itself to a foreign private person which, in turn, participates in the performance of public functions and thus gains a privileged position vis-a-vis other private law subjects within the jurisdiction of the State concerned." International concessions are not defined in international law and do not generally fall under it. Rather, they are governed by the municipal law of the conceding state. There may, however, be a law of succession for such concessions, whereby the concession is continued even when the conceding state ceases to exist.
In international law, a lease is "an arrangement whereby territory is leased or pledged by the owner-State to another State. In such cases, sovereignty is, for the term of the lease, transferred to the lessee State." The term "international lease" is sometimes also used to describe any leasing of property by one state to another or to a foreign national, but the normal leasing of property, as in diplomatic premises, is governed by municipal, not international, law. Sometimes the term "quasi-international lease" is used for leases between states when less than full sovereignty over a territory is involved. A true international lease, or "political" lease, involves the transfer of sovereignty for a specified period of time. Although they may have the same character as cessions, the terminability of such leases is now fully accepted.
Canadian concessions.
Following the First World War the Republic of France granted Canada perpetual use of a portion of land on Vimy Ridge under the understanding that the Canadians were to use the land to establish a battlefield park and memorial. The park, known as the Canadian National Vimy Memorial, contains an impressive monument to the fallen, a museum and extensive recreations of the wartime trench system, preserved tunnels and cemeteries.
Chinese concessions.
Between 1882 and 1884, the Qing Empire obtained concessions in Korea at Incheon, Busan and Wonsan. The concessions were occupied by Japan in 1894 after the outbreak of the First Sino-Japanese War. After China's defeat in that war, Korea (now with Japanese support) declared the unequal treaties with Qing China to be void, and unilaterally withdrew the extraterritoriality and other powers granted to China in respect of the concessions. The concessions were formally abolished in 1898.
German concessions.
All in China:
Japanese concessions.
In China:
In Korea (Chosen), before the Annex of Japan-Korea (1910):
Jointly held concessions.
On 7 July 1927, a Chinese city government of Greater Shanghai was formally established. 
In January/February 1931, the Japanese occupied the Hongkou District (Hongkew), and on 9 November 1937 the Chinese city of Shanghai, but only on 8 December 1941 would Japanese troops occupy the International Settlement (but not the French concession); it was dissolved by Japan in 1942. 
In February 1943 the settlement is officially abolished by the U.S. and Britain; in September 1945, the last territory is restored to China.