Question: Edward Hubbard wrote the definitive biography of an architect that designed over how many buildings?

Context paragraphs:
List of works by Thomas Lockwood: Thomas Meakin Lockwood (1830–1900) was an English architect whose main works are in and around Chester, Cheshire.  He was born in London, and brought up in East Anglia.  He trained in Chester with T. M. Penson, then established his own independent practice in the city in about 1860.  His most important patron was the First Duke of Westminster.  His sons W. T. and P. H. Lockwood joined him as partners in the practice in 1892.  According to the architectural historian Edward Hubbard he is the only 19th-century Chester architect, other than John Douglas, to have acquired a national reputation.  A memorial window to his memory is in the north aisle of St John the Baptist's Church, Chester.

List of works by P. D. Q. Bach: The following is a list of works by P.D.Q. Bach, a fictitious Bach family member, the alter ego of composer Peter Schickele.  The first section lists, in alphabetical order, those works which have been recorded, are listed in the annotated catalogue of P. D. Q. Bach music in "The Definitive Biography of P.D.Q. Bach", and/or are listed on the Theodore Presser website.  "Schickele numbers", or "S." numbers, associated with some of the compositions, have either been assigned arbitrarily (with humorous intent) or are missing, and are not intended to provide the same service as Bach-Werke-Verzeichnis (BWV) numbers, also known, especially in early compilations, as "Schmieder numbers" or "S. numbers" after compiler Wolfgang Schmieder.  The second section lists "undiscovered works" that are mentioned in "The Definitive Biography".  The third section lists works by Schickele that have appeared on P.D.Q. Bach recordings.  The fourth section lists a few selections, not by P.D Q. Bach/Schickele, that have appeared on P.D.Q. Bach recordings.

John Douglas (architect): John Douglas (11 April 183023 May 1911) was an English architect who designed over 500 buildings in Cheshire, North Wales, and northwest England, in particular in the estate of Eaton Hall.  He was trained in Lancaster and practised throughout his career from an office in Chester.  Initially he ran the practice on his own, but from 1884 until two years before his death he worked in partnerships with two of his former assistants.

Edward Hubbard: Edward Horton Hubbard (2 July 1937 – 31 May 1989) was an English architectural historian who worked with Nikolaus Pevsner in compiling volumes of the "Buildings of England".  He also wrote the definitive biography of John Douglas, and played a part in the preservation of Albert Dock in Liverpool.

Rajinikanth: The Definitive Biography: Rajinikanth: The Definitive Biography is a 2012 biography of the Indian actor Rajinikanth, written by Naman Ramachandran.  It is the second biography of the actor, following "The Name is Rajinikanth" (2008) by Gayathri Sreekanth.

History of Dianetics: The history of Dianetics possibly begins in the 1920s.  Its originator L. Ron Hubbard claimed that his ideas of Dianetics originated in the 1920s and 1930s.  By his own account, he spent a great deal of time in the Oak Knoll Naval Hospital's library, where he would have encountered the work of Freud and other psychoanalysts.  In April 1950, Hubbard and several others established the Hubbard Dianetic Research Foundation in Elizabeth, New Jersey to coordinate work related for the forthcoming publication.  Hubbard first introduced Dianetics to the public in the article "" published in the May 1950 issue of the magazine "Astounding Science Fiction".  Hubbard wrote "" at that time, allegedly completing the 180,000-word book in six weeks.

Listed buildings in Great Budworth: Great Budworth is a civil parish in Cheshire West and Chester, England.  The parish contains 59 buildings that are recorded in the National Heritage List for England as designated listed buildings.  Other than the village of Great Budworth, the parish is entirely rural.  Most of the listed buildings are houses, or buildings relating to farming, a high proportion of which are located within the village itself.  The village is described by Norman Bilsborough as being "probably one of the best-known villages in Cheshire", and Claire Hartwell "et al".  writing about the village in the "Buildings of England" series state "the immediate surroundings of the church make one of the best pieces of villagescape in the county".  The village is located in what was part of the estate of Arley Hall.  Between the 1860s and the end of the 19th century the owner of the hall, Rowland Egerton-Warburton, commissioned the restoration of existing buildings in the village and the construction of new ones.  To this end he employed architects working in the Vernacular Revival style, including John Douglas, Edmund Kirby, and William Eden Nesfield.  Douglas' biographer Edward Hubbard states that Egerton-Warburton had a "campaign to restore the village and render it picturesque in Victorian eyes".  Almost all the buildings in the centre of the village, those in Main Street, Church Street, and School Lane, are listed.

List of University of Oregon buildings: University of Oregon real estate includes buildings in a variety of architectural styles and eras.  Many buildings on the main campus were designed by Ellis F. Lawrence, who joined the university in 1914 as campus planner, but by 1915 he had founded the School of Architecture and had become chief architect of the university.  Lawrence also held a commission to design all buildings on campus as long as he remained in charge of the School of Architecture.  This commission was a source of extra income for Lawrence, and he designed buildings until his death in 1946.  Some of the Lawrence buildings are listed on the National Register of Historic Places.  Others are not themselves listed but are included in NRHP site surveys.  The Memorial Quadrangle, for example, contains buildings listed as contributing resources in the site survey for the Knight Library.  These buildings are Condon Hall, Chapman Hall, and the Jordan Schnitzer Museum of Art, although the museum is also separately listed.  The Women's Memorial Quadrangle is listed on the NRHP, and it contains three more Lawrence buildings which are contributing resources, Gerlinger Hall, Hendricks Hall, and Susan Campbell Hall.

Scientology and racism: Scientology founder L. Ron Hubbard has been accused of harboring racist views; in a letter to his first wife, Polly Grubb, Hubbard wrote "You shouldn’t be scrubbing the floor on your hands and knees.  Get yourself a nigger; that’s what they’re born for."  Hubbard also strongly defended the apartheid system in South Africa and reportedly considered founding his own all-white colony on the continent.  He also spoke ill of Asians, saying "The trouble with China is, there are too many chinks here".

Hen Llys: Hen Llys (or Henllys Hall) is a house in Manafon, Powys, Wales.  It is a Grade II listed building.  In his biography of John Douglas, Edward Hubbard attributes its design to this Chester architect.  In its listing, Cadw makes a firm attribution to Douglas as architect.

Supporting paragraphs: Edward Hubbard John Douglas (architect)
Answer: 500