Question: The 2013 Bilderberg Conference took place at a hotel with a private park that covers how many acres?

Context paragraphs:
Bilderberg Group: The Bilderberg Group, Bilderberg conference, Bilderberg meetings or Bilderberg Club is an annual private conference of 120 to 150 people of the European and North American political elite, experts from industry, finance, academia, and the media, established in 1954 by Prince Bernhard.

2010 Bilderberg Conference: The Bilderberg Conference 2010 took place at June 3–6, 2010, and were held in Sitges, Spain at Hotel Dolce.

2016 Bilderberg Conference: The 2016 Bilderberg Conference took place between 9-12 June 2016 at the Taschenbergpalais grand hotel in Dresden, Germany.

2015 Bilderberg Conference: The 2015 Bilderberg Conference took place between 11-14 June 2015 at the Interalpen-Hotel Tyrol in Telfs-Buchen, Austria.  The hotel had previously held the Bilderberg Conference in 1988.

The Grove, Watford: The Grove is a large hotel in Hertfordshire, England, with a 300–acre (1.2 km²) private park next to the River Gade and the Grand Union Canal.  It touches on its north-west corner the M25 motorway and remains a small part in Watford (St Luke) ( ).

Ginter Park: Ginter Park is a suburb neighborhood of Richmond, Virginia built on land owned and developed by Lewis Ginter.  The neighborhood's first well known resident was newspaperman Joseph Bryan, who lived in Laburnum, first built in 1883 and later rebuilt .  In 1895, many acres of land north of Richmond were purchased by Ginter in order to develop into neighborhoods.  Ginter Park and other neighborhoods were developed from this initial land purchase.  In Ginter Park are Union Theological Seminary & Presbyterian School of Christian Education and as well as Pollard Park.

2011 Bilderberg Conference: The Bilderberg Conference 2011 took place at June 9–12, 2011, and were held in Sankt Moritz, Switzerland at the Suvretta House.

2012 Bilderberg Conference: The Bilderberg Conference 2012 took place at May 30 - June 3, 2012 and were held in Westfields Marriott Hotel, Chantilly, Virginia, United States, previous conferences were already held here in 2002 and 2008, Haifa in Israel was speculated as a possible venue earlier.

1954 Bilderberg Conference: The Bilderberg Conference in 1954 was the very first meeting of the conference between politicians, bankers and monarchs, the founders and promoters were Prince Bernhard of the Netherlands (which was the president of the meeting until 1976) and the polish political advisor Józef Retinger.  It took place in Hotel de Bilderberg, Oosterbeek, Netherlands, and were held in 29–31 May 1954.

2013 Bilderberg Conference: The 2013 Bilderberg Conference took place June 6–9, 2013, at The Grove hotel in Watford, Hertfordshire, England.  It was the first Bilderberg Group conference to be held in the United Kingdom since the 1998 meeting in Turnberry, Scotland.

Supporting paragraphs: 2013 Bilderberg Conference The Grove, Watford
Answer: 300