Until the theatre at Earl's Court was built, Olympia could boast the largest stage in London. It is a huge glass and iron structure, with room enough to seat ten thousand spectators, and has pleasant gardens. Situated exactly opposite Addison Road Station, Kensington, Olympia is easily accessible from all parts of the Metropolis. Barnum's Show, the Paris Hippodrome, the Spectacle of Nero, Venice in London, Constantinople, the Orient, and the Sporting and Military Show, have all in turn occupied the building. An admirable innovation was the reserving of seats all over the building, including the cheapest parts. Towards the end of 1895 Olympia came under the management of Sir Augustus Harris.
source: The Queen's London : a Pictorial and Descriptive Record of the Streets, Buildings, Parks and Scenery of the Great Metropolis, 1896