On 1 October 1923, were added to Brighton borough and to Preston civil parish from Patcham parish: Brighton Corporation was developing the Moulsecoomb estate there at the time. On 1 April 1928, Brighton civil parish was extended to include Preston civil parish. On the same date the borough grew by nearly five times by adding Ovingdean and Rottingdean parishes in their entirety and parts of Falmer, Patcham and West Blatchington; it also exchanged small parts with Hove municipal borough. All the areas added to the borough became part of Brighton civil parish. From 1 April 1952, more of Falmer and part of the adjacent Stanmer parish were added; 20 years later, land and marine territory associated with the new Brighton Marina development also became part of Brighton. Except for a small addition of rural land in 1993 (from Pyecombe parish), Brighton Borough's boundaries remained the same until it was joined to Hove Borough in 1997 to form the unitary authority of Brighton and Hove.