Dome, the intention was that there would be no white elephants after the games. Some of the new facilities would be reused in their Olympic form, while others would be reduced in size and several would be relocated elsewhere in the UK. The plans would contribute to the regeneration of Stratford in east London, which would be the site of the Olympic Park, and of the neighbouring Lower Lea Valley. However, this required the compulsory purchase of some businesses and this caused controversy, with some of the business owners claiming that the compensation offered was inadequate. The purchased buildings were demolished to make way for Olympic venues and infrastructure improvements. The majority of venues were divided into three zones within Greater London: the Olympic Zone, the River Zone and the Central Zone. Also some venues (such as those for sailing) were outside the boundaries of Greater London. The IOC noted that future negotiations were necessary to ensure the use of the Old Trafford and Villa Park football stadiums. The need for compulsory purchase orders was also highlighted as a possible problem for the Olympic Park, but IOC did not expect this to cause any "undue delay to construction schedules". At the time of the bid, 60% of the venues and facilities were in place. The remaining venues were proposed to be completed between 2007 and the start of the games. At time of the bid the following were the tentative completion dates for some of the remaining venues: Channel Tunnel/Stratford rail link (2007); Aquatics Centre and London Velopark (2008); East London line extension (2010); Olympic Stadium and Heathrow Terminal 5 final completion (2011). Olympic Zone The Olympic Zone encompasses all of the facilities within the 500-acre (2 km²) Olympic Park in Stratford. This park was developed on existing waste and industrial land, at grid reference , just seven minutes by Olympic Javelin train from central London. The park contains: The Olympic Stadium, hosting the track and field athletics events as well as the opening and closing ceremonies. The Aquatics Centre, hosting diving, swimming and synchronised swimming. The Water Polo Arena, hosting water polo – the first Olympic venue dedicated to hosting the sport. The London Velopark, including a 6,000-seat indoor velodrome for track cycling and a 6,000-seat outdoor BMX racing track. The Riverbank Arena, with 15,000 and 5,000-seat arenas, hosting hockey. Four indoor arenas (Olympic Park Arenas 1–4), hosting basketball