Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Port Lympne Mansion - Port Lympne at Lympne Kent is an early twentieth-century country house built for Sir Philip Sassoon by Herbert Baker and Philip Tilden. Completed after the First World War it was abandoned after the Second World War following Sassoon's death in 1939. In 1973 it was purchased by John Aspinall as part of an expansion of his Howletts Zoo. The house is a Grade II* listed building as of 29 December 1966.
A:
Building