Question: Castleberry Hill is located less than five miles from one of the University System of Georgia's four research universities that had a total student population of approximately how much in 2015?
Context: The University System of Georgia (USG) is the State of Georgia Government Agency that includes 28 public institutions of higher learning in the U.S. state of Georgia.  The System is governed by the Georgia Board of Regents.  It sets goals and dictates general policy to educational institutions as well as administering Public Library Service of the state which includes 58 public library systems.  The USG also dispenses public funds (allocated by the state's legislature) to the institutions but not the lottery-funded HOPE Scholarship.  The USG is the fifth largest university system in the United States by total student enrollment, with 318,027 students in 28 public institutions.  The four larger systems are the University System of Ohio, City University of New York, California State University, and the State University of New York.  USG institutions are divided into four categories depending on their mission statements.  The categories include research universities, state universities, state colleges and regional universities. A research university is a university that expects all its tenured and tenure-track faculty to continuously engage in research, as opposed to merely requiring it as a condition of an initial appointment or tenure.  Such universities can be recognized by their strong focus on innovative research and the prestige of their brand names.  On the one hand, research universities strive to recruit faculty who are the most brilliant minds in their disciplines in the world, and their students in theory enjoy the opportunity to learn from such experts.  On the other hand, new students are often disappointed to realize their undergraduate courses at research universities are overly academic and fail to provide vocational training with immediate "real world" applications; but many employers value degrees from research universities because they know that such coursework develops fundamental skills like critical thinking. Castleberry Hill is a neighborhood in Atlanta, Georgia, adjacent to and southwest of the Downtown Atlanta.  It is a federally recognized historic district since 1985 and became a City of Atlanta Landmark District in 2006.  Since 2000, the area has experienced an influx of residents and new businesses.  The area, which is made up predominantly of Walker, Nelson and Peters Streets is home to a growing number of small art galleries, restaurants, coffee shops, and loft residences.  Less than one mile from the Historically Black colleges and universities that make up the Atlanta University Center Consortium and less than five miles from the expansive downtown campus of Georgia State University, the area also offers pristine local shopping, grocery, such as Boxcar Grocer, and spa services, like iwi Fresh.  Other notable area eateries include No Mas!  Cantina, a spacious Mexican-themed restaurant, bar and fine home furnishings establishment, often used as a point of reference.  Castleberry Hill residents gather at local watering holes, such as Elliott Street Pub and Bottle Rocket. The Lackawanna Trail School District is a public Pennsylvania school district.  It serves Nicholson Boro, Nicholson Township, Clinton Township and Factoryville borough in Wyoming County and Dalton borough, La Plume Township, Benton Township and West Abington Township in Lackawanna County.  The school district encompasses approximately 72.43 square miles and serves a resident population of 8,671.  The district has one (K-6) elementary school located on College Avenue, Factoryville and one (7-12) high school on Tunnel Hill Road, Factoryville.  As of the 2010 federal census, Lackawanna Trial School District has a total student population of 1,173.  Elementary school (623 with a student/teacher ratio of 13.26), high school (550 with a student/teacher ratio of 11.70). Tokyo International School was founded in 1997 in Tokyo, Japan by parents who wanted to provide an education for their children.  The school contains a pre-school, elementary and middle school with a total student population of approximately 350 students from 55 countries.  The 43 full-time faculty members come from 10 different countries.  Instruction is in English and the school follows the International Baccalaureate Organization curriculum guidelines.  It is accredited by New England Association of Schools and Colleges and the Council of International Schools.  TIS is also a Columbia University Readers and Writers 'Project' school.  This means it received regular visits on an annual basis from teacher trainers from Columbia University.  Admission guidelines are designed to ensure each class has no more than 16 students.  Located in the Minami Azabu area of central Tokyo, it is one of the few internationally accredited international schools in the center of the city.  The TIS Mission is to 'To nurture confident, open-minded, independently thinking, and well-balanced inquirers for global responsibility'. This is a list of Georgia State University people.  Georgia State University is an urban research university in downtown Atlanta, Georgia, United States.  Founded in 1913, it serves a diverse population of approximately 32,000 students, and is one of the University System of Georgia's four research universities.  The current university president is Mark P. Becker. Georgia State University (commonly referred to as Georgia State, State, or GSU) is a public research university in downtown Atlanta, Georgia, United States.  Founded in 1913, it is one of the University System of Georgia's four research universities.  It is also the largest institution of higher education in the University System of Georgia, with a total student population of approximately 51,000, including 32,082 graduate and undergraduate students in the downtown campus as of 2015. Paschal's La Carousel was a jazz club in Atlanta, Georgia.  Opened in 1960, it became known as Atlanta's "jazz mecca" as it featured top-name artists such as Aretha Franklin, Dizzy Gillespie, Gladys Knight, and Jimmy Smith.  It was the only nightclub in Atlanta open to blacks in the then-segregated city.  At the same time, an estimated 60 percent of its clientele were white, and the club also showed tolerance toward homosexuals.  The club was owned by brothers Robert and James Paschal, who also ran the Paschal's Restaurant next door and, in 1967, a 125-room motor hotel which they added to the premises.  The restaurant, lounge, and motel closed in 1996 and were sold to Clark Atlanta University for use as a student dormitory and conference centre.  An event space resembling the original La Carousel lounge was installed at Paschal's at Castleberry Hill, which opened in 2002. Liverpool John Moores University ("brevis:" LJMU) is a public research university in the city of Liverpool, England.  It has 21,875 students, of which 18,375 are undergraduate students and 3,500 are postgraduate, making it the 33rd largest university in the UK by total student population. The Purdue Research Parks are a network of four research parks located in Indiana, United States.  The 725 acre flagship West Lafayette park is located less than 2 mi north of Purdue University's West Lafayette campus, and is the largest university-affiliated research park in the United States.  The other facilities are located in Merrillville, Indianapolis, and New Albany.  The parks were developed by the Purdue Research Foundation.
Answer: 51,000