 The former plant built in 1874 was closed in 1981, the last gasometer was demolished in 1984.In honor of Berlin's 750-year jubilee the East German government drew up plans for an "inhabited park", including a memorial, a public pool, a planetarium, a school and a housing estate for 4,000 residents.The park was inaugurated on 16 April 1986, Thälmann's hundredth birthday.