Question: Who is the Mexican business magnate, investor, and philanthropist that owns the historic building located in downtown Detroit, Michigan built in 1905?

Context paragraphs:
Carlos Slim: Carlos Slim Helú (] ; born January 28, 1940) is a Mexican business magnate, investor, and philanthropist.  From 2010 to 2013, Slim was ranked as the richest person in the world.  He derived his fortune from his extensive holdings in a considerable number of Mexican companies through his conglomerate, Grupo Carso.

Marquette Building (Detroit): The Marquette Building is a historic building located in downtown Detroit, Michigan.  It was built in 1905, and stands at 243 West Congress Street.  211 West Fort Street lies to the north, Cobo Hall to the west, Detroit Riverside Hotel to the south, and Fort Shelby Hotel to the east.  The building is currently owned by Mexican billionaire, Carlos Slim.

Cowork at The Michigan: Cowork at the Michigan is a shared coworking space in the historic Michigan Building.  The Michigan Building was the former Michigan Theatre Building located in downtown Detroit, Michigan until it closed in 1976.  This coworking space is one of the first major projects the building has taken on since going into decay in the late-1970s.

Buhl Building: The Buhl Building is a skyscraper and class-A office center in Downtown Detroit, Michigan.  Architect Wirt C. Rowland designed the Buhl in a Neo-Gothic style with Romanesque accents.  Constructed in 1925, it stands at 26 stories in the Detroit Financial District across Congress Street from the Penobscot Building and across Griswold Street from the Guardian Building, all of which were designed by Wirt C. Rowland.  The Buhl Building stands on the corner of Congress St. West, and Griswold St. in Downtown Detroit.  The building stands atop what used to be the Savoyard Creek near its confluence with the Detroit River.  In 1836, the creek was covered and turned into a sewer.  The Savoyard Club occupied the 27th floor of the Buhl Building from 1928 until its membership dwindled and the club closed in 1994.  Suburban Mobility Authority for Regional Transportation has its headquarters in the building.

Blue Cross Blue Shield of Michigan Building: The Blue Cross Blue Shield of Michigan Building is a skyscraper located at 600 East Lafayette Boulevard in Downtown Detroit, Michigan, near the Renaissance Center complex.  It is also known as the Blue Cross Blue Shield Service Center.  It was constructed in 1971, and stands at 22 floors.  The building was constructed in a sunken plaza.  It houses Blue Cross Blue Shield of Michigan.  The campus in downtown Detroit also includes offices for 3,000 employees at Towers 500 and 600 of the Renaissance Center linked by the Detroit People Mover.

Lafayette Building (Detroit): The Lafayette Building was a high-rise office building located at 144 West Lafayette Boulevard in downtown Detroit, Michigan.  It was built in 1923 and occupied a triangular lot, bordered by Michigan Avenue, West Lafayette Boulevard, and Shelby Street.  The building was 14 floors tall, with one basement floor, and 13 above-ground floors.The office building was designed in the neo-classical architecture style by C. Howard Crane who built many of Detroit's theaters.  It is built with mainly brick, limestone, and terra cotta.  Its form mimicked the Flatiron Building in Manhattan.

Detroit Cornice and Slate Company Building: The Detroit Cornice and Slate Company Building is a Beaux-Arts style industrial office building located at 733 St. Antoine Street (at East Lafayette Street) in Downtown Detroit, Michigan.  It was listed on the National Register of Historic Places and designated a Michigan State Historic Site in 1974.

Hugo Salinas Price: Hugo Salinas Price (born 1932) is a Mexican business magnate, investor, and philanthropist.  He is the founder of Mexico's Elektra retail chain.  The current head of Elektra is his son Ricardo Salinas Pliego.  Elektra began as a workshop assembling electronic appliances for the Salinas Y Rochas chain, a small regional retailer of appliances.  Elektra then set up a direct sales operation offering appliances on installments.  Hugo Salinas Price currently is retired from retailing and focuses on being a proponent of a sound financial policy for Mexico.  Salinas Price is President, Mexican Civic Association Pro Silver, A.C.

Harmonie Centre: The Harmonie Centre, also known as the Breitmeyer-Tobin Building, is an eight-story commercial building located at 1308 Broadway Street (at the corner of Broadway and Gratiot) in Downtown Detroit, Michigan.  It is part of the Broadway Avenue Historic District.  It is also known as the Tobin Building.  The building was listed on the National Register of Historic Places in 1980.  The "east necklace" of downtown links Grand Circus and the stadium area to Greektown along Broadway.  The east neckace contains a sub-district sometimes called the "Harmonie Park District," which has taken on the renowned legacy of Detroit's music from the 1930s through the 1950s and into the present.

Farwell Building: The Farwell Building is a commercial building and residential building located at 1249 Griswold Street in Downtown Detroit, Michigan.  It was designated a Michigan State Historic Site in 1974, and listed on the National Register of Historic Places in 1976.

Supporting paragraphs: Marquette Building (Detroit) Carlos Slim
Answer: Carlos Slim