Marnell Corrao Associates
American architecture, design, and general contracting firm specializing in large-scale hotel and casino developments.
Last updated August 26, 2026
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Overview
Marnell Corrao Associates is an American architecture, design, and general contracting firm based in Enterprise, Nevada. Founded in 1974, the company developed a specialized position in the planning and delivery of large hotel, resort, and casino complexes, particularly in the Las Vegas market and in other United States gaming destinations. Its work combines architectural design with construction and project-delivery capabilities, allowing it to participate in major developments as more than a conventional design consultant. The firm is described as the oldest and largest hotel-casino design/build company in the United States. Its business has concentrated on large-scale hospitality and gaming projects, an area requiring coordination among architecture, casino planning, hotel operations, entertainment venues, retail, restaurants, parking, site infrastructure, and construction management. The company’s project portfolio includes recognizable Las Vegas properties such as Bellagio, the Rio All Suite Hotel and Casino, Wynn Las Vegas, Stardust, Boulder Station, Texas Station, and the Forum Shops. It has also worked on projects outside Nevada, including Borgata, Lumiere Place, Avi Resort & Casino, and the Osage Casino Hotel in Ponca City, Oklahoma. Marnell Corrao Associates’ scale is reflected in the number of hotel rooms associated with its construction activity. The firm had completed more than 55,000 hotel rooms by 2002 and more than 70,000 by 2005, according to the cited reference material. These figures place the company within the specialist infrastructure behind the expansion of the American casino-resort industry during the late twentieth and early twenty-first centuries. A major development connected with the company was M Resort, a resort and casino on Las Vegas Boulevard in Henderson, Nevada. Approval for the project was received on October 17, 2005, for a 79-acre site, and the casino opened on March 1, 2009. The project illustrates the company’s involvement not only in individual buildings but also in large, integrated resort developments requiring extended planning and construction periods. The company has also participated in tribal gaming and hospitality work. In 2012–2013, Marnell Companies worked with Square One and Osage Manhatta Builders on the Osage Casino Hotel in Ponca City, Oklahoma. Other listed work includes the proposed or planned XpressWest passenger rail project, demonstrating an association with infrastructure and destination-development initiatives beyond conventional casino buildings. Marnell Corrao Associates is privately held, and the available reference material does not identify its current executives, ownership structure, revenue, or official website. Its public identity is therefore principally defined by its specialized design-and-build role and by the prominent hotel, casino, retail, and resort projects attributed to it.
History
Marnell Corrao Associates was founded in 1974 in the United States and became a specialist in the architecture and construction of major hotel and casino properties. Rather than operating primarily as a general-purpose architectural practice, the company focused its business on complex hospitality and gaming developments, where design, construction, casino programming, hotel planning, retail, entertainment, and supporting infrastructure must be coordinated as a single destination project. The firm’s historical development is closely connected with the growth of the American casino-resort industry, especially in Nevada. Its portfolio includes several prominent Las Vegas-area properties, among them Bellagio, Boulder Station, the Forum Shops, Stardust, the Rio All Suite Hotel and Casino, Wynn Las Vegas, and Texas Station. These projects span different generations and formats within the gaming and hospitality sector, from major destination resorts to local and regional casino properties and integrated retail facilities. By 2002, the company had completed construction associated with more than 55,000 hotel rooms. By 2005, that figure had exceeded 70,000 rooms. The reported totals illustrate the scale of its participation in hotel and resort construction and help explain its description as the oldest and largest hotel-casino design/build firm in the United States. In the 2000s, the company was connected with the development of M Resort on Las Vegas Boulevard in Henderson. Approval for the project was granted on October 17, 2005, for a 79-acre site. The casino opened on March 1, 2009. M Resort represented the type of large, integrated destination project for which the firm was known, requiring a multi-year process from site approval through design, construction, and opening. Marnell Corrao Associates’ work was not limited to Nevada. Its listed projects include the Borgata and Lumiere Place, as well as the Avi Resort & Casino. The company also participated in the Osage Casino Hotel in Ponca City, Oklahoma. For that 2012–2013 project, Marnell Companies worked with Square One and construction company Osage Manhatta Builders. This work reflects the firm’s reach into regional and tribal gaming markets, where casino hotels often function as broad hospitality and entertainment anchors. The company has also been associated with XpressWest, a proposed passenger rail initiative connected with intercity travel and destination development. The available reference material does not provide enough detail to establish the firm’s precise scope, final contract status, or the project’s subsequent outcome. Marnell Corrao Associates remains described as a privately held company based in Enterprise, Nevada. Publicly available information in the supplied reference is limited regarding ownership, leadership, current operations, financial performance, and later projects. Its documented historical significance rests on its specialized design-build model and its participation in a substantial number of American hotel, casino, resort, and related destination developments.
- 2012
Osage Casino Hotel project period began
[1]Marnell Companies worked with Square One and Osage Manhatta Builders on the Osage Casino Hotel in Ponca City, Oklahoma, during the 2012–2013 period.
- 2009
M Resort opened
[1]The M Resort casino opened on March 1, 2009.
- 2005
Hotel-room total exceeded 70,000
[1]By 2005, the company was reported to have completed more than 70,000 hotel rooms.
- 2005
M Resort project approved
[1]Approval was received on October 17, 2005, for the M Resort project on a 79-acre site along Las Vegas Boulevard in Henderson, Nevada.
- 2002
More than 55,000 hotel rooms completed
[1]The company was reported to have completed construction associated with more than 55,000 hotel rooms.
- 1974
Company founded
[1]Marnell Corrao Associates was established in the United States as an architecture and construction firm specializing in large hospitality and gaming projects.
Products and positioning
A specialist design-build and general contracting firm for large hotel, casino, resort, and entertainment developments, with a strong association with the Las Vegas hospitality and gaming sector.
Casino resort
Bellagio
A major Las Vegas casino-resort project listed among Marnell Corrao Associates’ architecture and construction work. It represents the firm’s involvement in large destination properties combining gaming, hotel accommodation, entertainment, and other resort functions.
Casino resort · 2009
M Resort
A resort and casino on Las Vegas Boulevard in Henderson, Nevada. The project received approval in 2005 on a 79-acre site and opened on March 1, 2009, illustrating the firm’s role in multi-year, integrated resort development.
Casino hotel
Boulder Station
A Las Vegas-area casino hotel listed as one of the company’s completed architecture and construction projects.
Retail and entertainment complex
Forum Shops
A major retail destination associated with the Las Vegas resort corridor and included in the firm’s project portfolio. It reflects the company’s work beyond casino gaming spaces into integrated hospitality and destination retail.
Casino resort
Stardust
A historic Las Vegas casino-resort property listed among the firm’s architecture and construction projects.
Casino hotel
Rio All Suite Hotel and Casino
A Las Vegas casino hotel listed in the company’s portfolio, representing its work on large hotel-centered gaming properties.
Casino resort
Avi Resort & Casino
A casino-resort project listed among Marnell Corrao Associates’ work outside the central Las Vegas portfolio.
Casino resort
Borgata
A major casino-resort project listed in the company’s architecture and construction portfolio.
Casino resort
Wynn Las Vegas
A Las Vegas destination resort listed among the company’s major projects.
Casino hotel
Texas Station
A Las Vegas-area casino hotel included in the firm’s project list.
Casino hotel
Lumiere Place
A casino and hospitality development listed among the company’s projects.
Tribal casino hotel · 2013
Osage Casino Hotel
A Ponca City, Oklahoma casino hotel developed during 2012–2013 through collaboration involving Marnell Companies, Square One, and Osage Manhatta Builders.
Transportation infrastructure
XpressWest
A passenger rail initiative listed among the company’s architecture and development-related projects. The supplied material does not specify the firm’s exact responsibilities or the project’s final status.
Brand decisions
2005
Proceeding with the M Resort developmentStrategyBackground
The company was associated with a proposed large resort and casino on a 79-acre site along Las Vegas Boulevard in Henderson, Nevada.
Action taken
Project approval was obtained on October 17, 2005, allowing the development to proceed toward construction.
Aftermath
The M Resort casino opened on March 1, 2009.
Sources1 sources
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