the Convention Center to Slate Avenue. As its name implies, this area contains mostly warehouses from the railroad era. Plaza District The Plaza District is the central area of downtown, bounded by Roma, Copper, Seventh, and the railroad tracks. It is centered on Civic Plaza and includes many of Albuquerque's large office and government buildings including the Albuquerque City-County Building, the Convention Center, Albuquerque Plaza, the Compass Bank Building, and the Albuquerque Petroleum Building. The Main Library of the Albuquerque/Bernalillo County Library System is also located in this district. Arts and Entertainment District This district is centered along Central Avenue and Gold Avenue east of First Street. It contains most of downtown Albuquerque's historic buildings as well as most of its shopping, dining, and nightlife destinations. Notable landmarks in this district include the KiMo Theater, Occidental Life Building, First National Bank Building, and Sunshine Building. There is a small concentration of government and office buildings on Gold Avenue which includes the Dennis Chavez Federal Building, Gold Building, and Simms Building. Amy Biehl High School is also located in this district. Transportation Center District This is the smallest district, encompassing the area south of Central Avenue and east of First Street. Most of the district is occupied by Alvarado Transportation Center. Casa District The southernmost part of downtown, the Casa District includes the area between Gold and Coal Avenue, extending all the way west to Tenth Street. This is a primarily residential district, with a large number of loft apartment buildings. Alvarado Square, the location of the PNM Building and the headquarters of Bernalillo County, is also located in the Casa District. Buildings Tallest buildings Downtown Albuquerque contains most of the city's highrise buildings, including the four tallest. The tallest downtown buildings are listed below: Historic landmarks There are a number of buildings in downtown that are on the National Register of Historic Places: KiMo Theater, one of the city's best-known landmarks The old Federal Building and U.S. Courthouse First National Bank Building Hotel Andaluz Occidental Life Building Old Post Office Simms Building Southwestern Brewery and Ice Company Sunshine Building Transportation Downtown is the center of public transit in the city, and is served by a network of ABQ RIDE routes including local routes, both the Red and Blue Albuquerque Rapid Transit BRT routes, and the Blue ARTx route, most of which include stops at the Alvarado Transportation Center. ABQ RIDE