Question: What type of building did the Seneca Indian Tribe open in Niagara Falls?
About the article "Niagara Falls", section "American side".

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From the U.S. side, the American Falls can be viewed from walkways along Prospect Point Park, which also features the Prospect Point Park observation tower and a boat dock for the "Maid of the Mist".
Goat Island offers more views of the falls and is accessible by foot and automobile traffic by bridge above the American Falls.
From Goat Island, the Cave of the Winds is accessible by elevator and leads hikers to a point beneath Bridal Veil Falls.
Also on Goat Island are the Three Sisters Islands, the Power Portal where a huge statue of Nikola Tesla (the inventor whose patents for the AC induction motor and other devices for AC power transmission helped make the harnessing of the falls possible) can be seen, and a walking path that enables views of the rapids, the Niagara River, the gorge, and all of the falls.
Most of these attractions lie within the Niagara Falls State Park.
The Niagara Scenic Trolley offers guided trips along the American Falls and around Goat Island.
Panoramic and aerial views of the falls can also be viewed from the Flight of Angels helium balloon ride, or by helicopter.
The Niagara Gorge Discovery Center showcases the natural and local history of Niagara Falls and the Niagara Gorge.
A casino and luxury hotel was opened in Niagara Falls, New York, by the Seneca Indian tribe.
The Seneca Niagara Casino occupies the former Niagara Falls Convention Center.
The new hotel is the first addition to the city's skyline since completion of the United Office Building in the twenties.
Pataki has been a long advocate of Native American casinos in upstate New York.
He has proposed the creation of several casinos throughout Upstate with the revenue being shared by the state, tribe and municipal government.
In the 1990s he was able to secure the creation of one casino on an Indian reservation outside Syracuse.
His plans to create new casinos were blocked by Assembly Speaker Sheldon Silver until after the Sept. 11 attacks, when Silver was persuaded that more money could come into the state government.
Pataki soon signed an agreement to create new casinos in the Catskills, Niagara Falls, and in Buffalo.
The Seneca Niagara Casino opened in Niagara Falls in January 2003. 
 Foxwoods Resort Casino, Connecticut, USA (capital loan to the Mashantucket Pequot tribe through Kien Huat Realty) Seneca Niagara Casino & Hotel, Niagara Falls, USA (capital loan to Seneca Nation of Indians through Kien Huat Realty) Monticello Raceway, Catskills (majority shareholder of Empire Resorts through Kien Huat Realty) Massachusetts Region C casino development (financing the development and lobbying expenses behind Wampanoag people efforts to secure preferred state gaming rights)  
The tribe owns and operates the Seneca Buffalo Creek Casino, located in Buffalo, New York.
They also own Seneca Gaming and Entertainment in Irving; Seneca Allegany Casino in Salamanca; Seneca Nation Bingo, Allegany in Salamanca; and Seneca Niagara Casino in Niagara Falls.
Through a tribal-owned holding company, the tribe owns a telecommunications firm, Seneca Telecommunications, and a radio station, WGWE.
Under the Porter administration, the Seneca Nation has made an effort to diversify its business offerings and has promoted, through an economic development corporation, the creation of new Seneca-owned businesses, outside the nation's traditional strongholds of gasoline and tobacco products.
One of the tobacco products is a brand of cigarettes called Native Pride.
The tribe also owns its own small chain of smoke shops and gas stations under the "Seneca One Stop" brand; the vast majority of smoke shops on Seneca reservations, however, are independently owned.
The refusal of Seneca businesses to pay New York state excise taxes, and the resulting price advantage the Senecas have over non-Senecas as a result, has been a source of controversy for several decades. 
Seneca Niagara Casino & Hotel is a casino located in Niagara Falls, New York and was built to compete with Casino Niagara and Niagara Fallsview Casino Resort in Niagara Falls, Ontario.
It was formerly the Niagara Falls Convention and Civic Center.
The casino floor has an area of with 99 gaming tables and 4,200 slot machines.
It is the largest hotel in New York outside of Manhattan.