Question: Who was the architect of the opera house where Thaïs was first performed?

Context articles: Antigo Opera House
Lexington Opera House
Pella Opera House
Shanghai Opera House
Phoenix Opera House Block
Peabody Opera House
Royal Opera House (Mumbai)
Claremont City Hall
Palais Garnier
Thaïs (opera)

The Antigo Opera House is a historic opera house and concert hall in Antigo, Wisconsin, United States.
 The brick building was built in 1904 by architect J.H. Jeffers in the Classical Revival style.
 The opera house could seat 1100 people.
 In addition to its use for entertainment, the building served as an armory during World War I and is now an apartment building.
 The opera house was added to the National Register of Historic Places on January 12, 1984.
The Lexington Opera House is a theatre located at 401 West Short Street in downtown Lexington, Kentucky.
 Built in 1886, the Opera House replaced the former theatre, located on the corner of Main and Broadway, after fire destroyed it in January 1886.
 The new Opera House was designed by the renowned architect Oscar Cobb and is listed on the National Register of Historic Places for its historical and architectural significance.
 Now owned and operated by the Lexington Center Corporation, the Lexington Opera House is host to ballet, opera, children's productions, family shows, comedy, music and professional national Broadway tours.
 The Lexington Opera House is one of the only 14 theatres in the country built before 1900 with less than 1,000 seats that is still in operation as a live performance venue.
The Pella Opera House is a historic building located in Pella, Iowa, United States.
 Herman Rietveld, a local businessman and promoter, was the main backer for building the opera house, which was underwritten by the Pella Opera House Association.
 A previous opera house had been destroyed in a fire in the late 19th century.
 Pella architect Henry DeGooyer designed the four story, brick Romanesque Revival structure.
 He used the opera house in Sioux City, Iowa, as his guide.
 The locally produced orange-colored bricks are said to be distinctive to Pella.
Shanghai Opera House (; Shanghainese: Zånhae Gujihyu) is the official government-funded western-style opera company of Shanghai, China, and the resident opera company at the new Shanghai Grand Theatre (上海大剧院 "Shanghai Da Juyuan").
 Although the term "Opera House" is often applied to the building, both in English and Chinese texts, officially the building is not an opera house and the term "Shanghai Opera House" properly applies only to the performing company, not the building, as is also true for its senior sister company, the China National Opera House (CNOH) in Beijing.
 The reason for the distinction is found in that the Chinese character "Yuan" (院) applies primarily to a school or institute or dramatic troupe rather than the building in which a school, institute or dramatic company resides.
The Phoenix Opera House Block is a historic building in Rushville, Illinois.
 Built in 1882, the building housed commercial businesses on the first floor and an opera house on the second floor.
 The opera house hosted traveling performers and theater companies as well as local social events.
 The opera house closed in 1910, as churches began to host the town's social functions and the local movie theater provided entertainment.
 From 1924 to 1956, the opera house served as a Masonic lodge.
 The building is one of the few surviving examples of a combined opera house and commercial building.
The Peabody Opera House (formerly known as the Kiel Opera House) is a civic performing arts building located in St. Louis, Missouri.
 Founded as the Kiel Opera House, it opened in 1934 and operated until 1991, when it and the adjacent Kiel Auditorium were closed so the auditorium could be demolished and replaced by the Scottrade Center.
 When the auditorium was slated for demolition, the owners of the complex promised to rehabilitate the opera house as well.
 The owners, however, never renovated the building, instead claiming that they had fulfilled their financial obligations.
 In June 2009, the St. Louis Board of Aldermen voted 25–1 to subsidize the renovation and reopening of the Opera House under the direction of its new owners, Sports Capital Partners.
 The subsidies were funded by municipal bonds and state/federal historic tax credits.
 On July 12, 2010, it was announced that the name of the opera house would be changed to the Peabody Opera House, named after the company Peabody Energy.
 The renovation lasted for fourteen months and included the construction of a new entrance for the building.
Royal Opera House, also known as Opera House in Mumbai (formerly Bombay), is India's only surviving opera house.
 Situated on Charni Road, near Girgaum Chowpatti beach, the adjective ‘Royal’ was prefixed to ‘Opera House’ to reflect the fact that its foundation stone was laid during the British Raj in 1909, and King George V inaugurated the building in 1911 while the building was still under construction.
 Work on the Royal Opera House was completed in 1912, although additions were made to the building up to 1915.
 After years of neglect following its closure in 1993, restoration work started in 2008.
 The exterior restoration was completed in 2011 and restoration was completed in 2016.
 The area around the theatre is also referred to as the Opera House in Mumbai.The Opera House area has many jewellery, metal and IT companies.
 On 21 October 2016, after a gap of 23 years, Royal Opera House hosted performance of Bombay-born British soprano Patricia Rozario and her husband, pianist Mark Troop.
 The private event was organised by Opera House owners Maharaja Joytendrasinhji Jadeja and Maharani Kumud Kumari Jadeja of Gondal, Gujarat.
Claremont City Hall, also known as the Claremont Opera House, is located at 58 Opera House Square in the heart of Claremont, New Hampshire, United States.
 The monumental Italian Renaissance Revival two-story brick and brownstone building was designed by New York City architect Charles A. Rich, an alumnus of nearby Dartmouth College, and built between 1895 and 1897.
 Hira R. Beckwith, an architect in Claremont, was the contractor.
 Many of the construction materials for the building came from the surrounding region.
 The foundation consists of Green Mountain rock, and the base was dressed Connecticut River brownstone from Springfield, Massachusetts.
 The major part of the exterior is built from nearly one million bricks from Lebanon, New Hampshire.
 The original design of the building included first floor that housed a meeting space seating 700, while the upper floor housed the "opera house" (auditorium), which seated nearly 1,000 and included a stage adequate for mounting theatrical productions.
 Rich and Beckwith spent two years and $62,000 to construct the building as a regional center for entertainment, cultural, community and political events.
 The building was dedicated on June 22, 1897.
The Palais Garnier (] French    ) is a 1,979-seat opera house, which was built from 1861 to 1875 for the Paris Opera.
 It was called the Salle des Capucines, because of its location on the Boulevard des Capucines in the 9th arrondissement of Paris, but soon became known as the Palais Garnier, in recognition of its opulence and its architect, Charles Garnier.
 The theatre is also often referred to as the Opéra Garnier (French    ) and historically was known as the Opéra de Paris or simply the Opéra, as it was the primary home of the Paris Opera and its associated Paris Opera Ballet until 1989, when the Opéra Bastille opened at the Place de la Bastille.
 The Paris Opera now mainly uses the Palais Garnier for ballet.
Thaïs (] ) is an opera, a "comédie lyrique" in three acts and seven tableaux, by Jules Massenet to a French libretto by Louis Gallet, based on the novel "Thaïs" by Anatole France.
 It was first performed at the Opéra Garnier in Paris on 16 March 1894, starring the American soprano Sibyl Sanderson, for whom Massenet had written the title role.
 The original production was directed by Alexandre Lapissida, with costumes designed by Charles Bianchini and sets by Marcel Jambon (act 1, scene 1; act 3) and Eugène Carpezat (act 1, scene 2; act 2).
 The opera was later revised by the composer and was premiered at the same opera house on 13 April 1898.