Question: Open House is a 2004 real estate musical film that stars an actor and singer who is best known for originating the role of Mark Cohen in what Broadway production?

Context articles: John Gallagher Jr.
Open House (2004 film)
Nick Cordero
Open House London
Anthony Rapp
Craig Venezia
Look Around (Anthony Rapp album)
Armando Montelongo
Chip Zien
Alison Bartlett-O'Reilly

John Howard Gallagher Jr. (born June 17, 1984) is an American actor and musician known for originating the role of Moritz Stiefel in Duncan Sheik and Steven Sater's rock musical "Spring Awakening", which earned him a Tony Award for Best Featured Actor in a Musical.
 He also played Johnny in Green Day's Broadway musical, "American Idiot", Lee in the 2011 Broadway production of "Jerusalem," and Edmund in the 2016 Broadway revival of "Long Day's Journey Into Night".
 He portrayed Jim Harper in Aaron Sorkin's drama series "The Newsroom", starred in the HBO mini-series "Olive Kitteridge", and played Emmett DeWitt in "10 Cloverfield Lane".
Open House is a 2004 real estate musical film starring Hedy Burress, Ann Magnuson, Anthony Rapp, Sally Kellerman, Jenna Leigh Green and Kellie Martin, and directed by Dan Mirvish, a co-founder of the Slamdance Film Festival.
 It played on the film festival circuit in 2004–05 and was released on DVD through Wellspring Media.
 All the actors sang live on set, rather than lip synching.
Nick Cordero is a Canadian actor.
 He appeared on Broadway in 2014 in the musical "Bullets Over Broadway" in the role of Cheech, for which he was nominated for the Tony Award for Best Featured Actor in a Musical and the Drama Desk Award for Outstanding Featured Actor in a Musical.
 He won the Outer Critics Circle Award for Outstanding Featured Actor in a Musical and a Theater World Award for the role.
 He originated the title role in the Off-Broadway production of "The Toxic Avenger".
 He also played the role of Dennis in "Rock of Ages" on Broadway in 2012 and on tour.
 In March 2016, he joined the Broadway production of "Waitress", playing the role of Earl.
 He left "Waitress" to join the Broadway premier of the musical "A Bronx Tale", as "Sonny" at the Longacre Theatre starting on November 3, 2016.
Open House London is an event which promotes appreciation of architecture by the general public.
 It is a part of the organisation Open-City and is best known for its annual Open House Weekend which is a two-day event held on one weekend each September throughout London since 1992.
 The event forms a London version of the European Heritage Days ("Journées Européennes du Patrimoine"), a Europe-wide event that started as "Journées Portes ouvertes des monuments historiques" (Historic Monument Open Door Days) in France in 1983.
 During the Open House Weekend many buildings considered to be of architectural significance open their doors for free public tours.
 Heritage Open Days is a similar event covering the rest of England, and takes place the previous weekend to Open House London.
Anthony Deane Rapp (born October 26, 1971) is an American stage and film actor and singer best known for originating the role of Mark Cohen in the Broadway production of "Rent" in 1996 and later for reprising the role in the film version and the Broadway Tour of "Rent" in 2009.
 He also performed the role of Charlie Brown in the 1999 Broadway revival of "You're a Good Man, Charlie Brown" and originated the role of Lucas in the musical "If/Then" in 2014.
Craig Venezia is a video and television marketing executive with over 25 years of expertise.
 He is the founder and CEO of San Francisco-based Visual Rivet, an ad agency/production company that creates, produces and distributes video and TV narratives that persuade audiences to do something, like buy a product/service, ask for more information, or further engage with a brand.
 In his free time, Craig is a nationally-recognized real estate journalist and author of the best-selling book "Buying a Second Home: Income, Getaway or Retirement" originally published by NOLO.
 As a contributing real estate writer for the "San Francisco Chronicle", Venezia helped homebuyers understand and navigate the complexities of one of the most expensive housing markets in the U.S., the San Francisco Bay Area.
 An authority on private mortgages.
 Venezia has appeared on CNN Money's "Open House" and been quoted by hundreds of media outlets including "The New York Times", "The Los Angeles Times" and "Men's Health" to name a few.
Look Around is the first full-length album by American actor/singer Anthony Rapp, known as a singer for his performance as Mark Cohen in the musical Rent and the film adaptation of the musical.
 It was released on October 1, 2000.
Armando Montelongo, Jr. (born 1970) is an American real estate entrepreneur and public speaker, best known for his role on the A&E reality TV show "Flip This House".
 He is the founder of a national real estate investment seminar company called Armando Montelongo Companies.
 In 2012, Montelongo established his company headquarters in San Antonio, Texas.
 Armando continues to invest heavily in real estate while holding seminars in several cities weekly, and personally conducting nine three-day seminars annually.
Jerome Herbert "Chip" Zien (born March 20, 1947) is an American actor.
 He is best known for playing the lead role of the Baker in the original Broadway production of "Into the Woods" by Stephen Sondheim.
 He has appeared in all of the "Marvin Stories" musicals by William Finn: "In Trousers", "March of the Falsettos", "Falsettoland" and "Falsettos".
 He played the role of Thénardier in the Broadway production of "Les Misérables" and Mark Rothenberg in the film "United 93".
 He is also known for providing the voice of Howard in the film "Howard the Duck".
Alison Bartlett-O'Reilly (born July 14, 1971) is an American actress and real estate agent, best known for portraying Gina Jefferson on "Sesame Street".
 She played the character on an on-and-off basis in 1985, and became a regular in November 1987, although she has not been seen on the show since 2015.
 She appeared on Broadway, most notably in the original Broadway production of "Hurlyburly".