Louis Deroshia (plaintiff) owned a restaurant located on property he leased from Union Terminal Piers (defendant). The lease was for a term of 10 years, beginning in 1968, with options to renew. In 1978, the lease was renewed through June 10, 1983. In March 1983, Union notified Deroshia by letter that the lease would not be renewed a second time. Although the renewed lease expired on June 10, 1983, Deroshia remained in possession of the property, claiming that Union’s letter was not sufficient to terminate the lease. Six days after expiration of the lease, Union changed the locks on the restaurant while it was closed. Deroshia filed suit against Union, contending that Union was not permitted to resort to such measures.