Brooklyn, New York City’s most populous borough, boasts a population close to 2.5 million residents. If it were a city, it would be the fourth largest in the country. This region of New York is known for its distinct culture and art scene. Several ethnic, cultural, and racial enclaves dominate different parts of Brooklyn. Downtown Brooklyn is known as the third-largest central business district in New York City. In this part of Brooklyn, several residential buildings are rapidly being built. The northwestern neighborhoods between Prospect Park and the Brooklyn Bridge are home to the richest neighborhoods in Brooklyn and cultural institutions. Working class communities and art culture can be found further north. Southern and Central Brooklyn are characterized by its culturally distinct neighborhoods including African Americans, Italian-Americans, and Ultra-Orthodox Jews. The economy of Brooklyn is affected by population flows and most importantly, the performance of the national/city economy. Since 1975, jobs in Brooklyn have become mostly service-based. Construction in Brooklyn is a rapidly growing sector. Brooklyn is home to the Brooklyn Museum and several colleges including Brooklyn Law School, Long Island University, and Saint Francis College. For transportation, residents of Brooklyn can use the public transit which includes 18 New York City subway lines and an extensive bus network.