Question: Elements of what architectural styles are included in the design of the building that is located at 503 Main Street in Ligonier, Indiana?  

Context articles: List of new churches by John Douglas
Charles Kent House
Ahavas Shalom Reform Temple
Poultney Main Street Historic District
Edmund E. Goodwin House
Beirut City Hall
Main Street–Frye Street Historic District
Ligonier Historical Museum
Stapleford–Hoover–Whitney House
West Main Street District (Kent, Ohio)

John Douglas (1830–1911) was an English architect based in Chester, Cheshire.
 His output included new churches, alterations to and restoration of existing churches, church furnishings, new houses and alterations to existing houses, and a variety of other buildings, including shops, banks, offices, schools, memorials and public buildings.
 Perhaps his best-known design is that for the Eastgate Clock in Chester.
 His architectural styles were eclectic, but as he worked during the period of the Gothic Revival much of his output incorporates elements of the English Gothic style.
 He was also influenced by architectural styles from the mainland of Europe, and frequently included elements of French, German, and Netherlandish architecture.
 Douglas is probably best remembered for his incorporation of vernacular elements in his buildings, in particular half-timbering, in which he was influenced by the black-and-white revival in Chester.
 Other vernacular elements he employed included tile-hanging, pargeting, and the use of decorative brick in diapering and the design of tall chimney stacks.
 Of particular importance is Douglas' use of joinery and highly detailed wood carving.
The Charles Kent House, also known as the Palmer House, is a historic structure in Kent, Ohio, United States.
 It has been listed on the National Register of Historic Places since February 23, 1978.
 An example of Gothic Revival architecture, the house also features elements of the Greek Revival and Carpenter Gothic architectural styles.
 It is at 125 North Pearl Street in central Kent, immediately north of the West Main Street District.
 It was built in 1843 as the home of Charles Kent, son of Zenas Kent and brother of Marvin Kent, the namesake of the city of Kent.
 In 1909 it was moved by owner Henry Green 150 ft north of its original location along West Main Street to the site on North Pearl Street.
 Martin L. Davey, who would later serve as mayor of Kent, followed by U.S. Representative, and eventually as Governor of Ohio, persuaded the owner to move the house to avoid demolition.
Ahavas Shalom Reform Temple, also known as Trinity Assembly of God Church, is a historic synagogue located at Ligonier, Noble County, Indiana.
 It was built in 1889, and is a one-story, red brick building with Gothic Revival and Romanesque Revival style design elements.
 It has a reek cross plan and is topped by a steep cross-gabled roof.
 It features an entrance tower topped by a steep pyramidal roof.
 In 1954, the building was sold to a Methodist congregation and now houses the Ligonier Historical Museum.
The Poultney Main Street Historic District encompasses the commercial and residential historic core of the village of Poultney, Vermont.
 Centered on Main Street and East Main Street, between College Avenue and St. Raphael's Catholic Church, the district includes a diversity of architectural styles, as well as civic, religious, and commercial functions spanning a period of more than 100 years.
 The district was listed on the National Register of Historic Places in 1988.
The Edmund E. Goodwin House is a historic house at 503 Main Street in Sanford, Maine.
 It was built in 1899 for Edmund Goodwin, a prominent local businessman, and is a well-preserved example of Queen Anne Victorian architecture.
 The house was listed on the National Register of Historic Places in 1975.
 It is owned by the Sanford Historical Society.
Beirut City Hall was built in Beirut, Lebanon in 1924, and has become an architectural landmark in the downtown area of Beirut Central District.
 It features a yellow limestone facade and combines various architectural styles.
 The building is located on the intersection of Foch Street and Rue Weygand in the city center.
 The building is in the Venetian and Arabesque architectural styles, a mix that expresses the regional identity of the area.
 The building was restored after the Lebanese Civil War and it currently houses the office of the Governor of Beirut and the municipal council.
 It is open to the public and for official registration of documents.
The Main Street–Frye Street Historic District is a historic district comprising houses on Frye Street and parts of College Street and Main Street in Lewiston, Maine.
 This area was part of the most fashionable residential district of the city in the second half of the 19th century, and was home to many of the city's elite.
 Its architectural styles are diverse, with a significant number of homes designed by local architect George M. Coombs.
 The district was added to the National Register of Historic Places in 2009.
The Ligonier Historical Museum is a museum in Ligonier, Indiana that is housed in the 1889 building of Congregation Ahavas Sholem (Lovers of Peace).
 The building is listed on the National Register of Historic Places.
 It is located at 503 Main Street.
 It is one of the few surviving 19th-century synagogues in the United States.
The Stapleford–Hoover–Whitney House is a historic house located at 401 North Main Street in Vermont, Illinois.
 Built circa 1855, the house was twice remodeled and incorporates elements of three different architectural styles.
 The original house was built for businessman and speculator Edward Stapleford; it had an I-house plan with a Greek Revival design, which is still reflected in its entrance and windows.
 Stapleford hanged himself in 1857 after going into debt via a speculation gone wrong; his wife Sarah lived in the house until 1871, when it was purchased by Dr. A. L. Hoover.
 Hoover, who ran a medical practice in the village, added the house's Italianate features, which included a hip roof with a bracketed cornice and two ornate porches.
 Merchant George F. Whitney bought the house in the 1880s; his wife and son added the Queen Anne style bay window in 1892.
The West Main Street District is a historic district in Kent, Ohio, United States, listed on the National Register of Historic Places.
 The district encompasses 25 buildings, most of which are houses, on both sides of West Main Street from its intersection with North and South Mantua Streets on the east to the intersection with North and South Chestnut Streets.
 It was listed June 17, 1977.
 Included in the district is the Kent Masonic Center, itself listed on the register in 1974, as well as the home of Martin L. Davey, who served as Governor of Ohio from 1935–1939.
 Architectural styles represented in the district include Commercial style, Eastlake, Gothic Revival, Greek Revival, Italianate, and Queen Anne style.